Database Users

SM-N910K stuck on 3G in Brazil

Ok, so i ordered a SM-N910U from 28mobile.com, and they sent me a carrier branded SM-n910K, which by its specifications should work with Brazilian LTE (band 7 - 2600). However I am stuck on 3g. I was wondering if maybe the whole internet is wrong and this device doesnt support this band, or maybe its some sort of carrier lock. Also, how do i disable the awful branding, will flash a different firmware work and which do i flash?
Thanks

repl0id said:
Ok, so i ordered a SM-N910U from 28mobile.com, and they sent me a carrier branded SM-n910K, which by its specifications should work with Brazilian LTE (band 7 - 2600). However I am stuck on 3g. I was wondering if maybe the whole internet is wrong and this device doesnt support this band, or maybe its some sort of carrier lock. Also, how do i disable the awful branding, will flash a different firmware work and which do i flash?Thanks
Click to expand...
Click to collapse
1) check frequencies that U model supports @ samsung website (its asian/hong kong, right? those miss some frequencieos)
2) check which frequencies are used for 4g by your brazilian telco.
3) compare.
if frequencies match, you might want to try:
1) getting a new sim that is surely 4g-capable
2) getting an iphone nano-sim. this is crazy, but for many users in russian forums that has solved 4g connectivity issues with one telco.
3) making sure your plan supports 4g
4) ensure you have 4g coverage.

lisbon2004 said:
1) check frequencies that U model supports @ samsung website (its asian/hong kong, right? those miss some frequencieos)
2) check which frequencies are used for 4g by your brazilian telco.
3) compare.
if frequencies match, you might want to try:
1) getting a new sim that is surely 4g-capable
2) getting an iphone nano-sim. this is crazy, but for many users in russian forums that has solved 4g connectivity issues with one telco.
3) making sure your plan supports 4g
4) ensure you have 4g coverage.
Click to expand...
Click to collapse
1) Sim is 4g
2)will try
3) IT does
4) I do
Is the SM-N910U the same as the SM-N910K as far as LTE bands go? I dont get it, they are both supposed to support Band 7 - 2600MHZ, which is the one we have over here. What about flashing a different firmware? I've been trying with odin, to no success.

They do support that frequency so it's probably something to do with your sim card or carrier?
And 28mobile told me I was receiving one model only to get the k model like you. Wasn't happy. The updates for firmwares are slow

lawtq said:
They do support that frequency so it's probably something to do with your sim card or carrier?
And 28mobile told me I was receiving one model only to get the k model like you. Wasn't happy. The updates for firmwares are slow
Click to expand...
Click to collapse
Well, I am on a LTE plan, tried 3 different sims already, they are all stuck on 3G...And all our carriers have the same band, which is 7...So it's not the sim or the carrier...its the phone. I bet that there's some sort of lock going on, since all roaming options are grayed out (the phone is not stuck on roaming, however). I am trying to flash any other model's firmware, like U, C and even S, but odin always fails when trying.

repl0id said:
Ok, so i ordered a SM-N910U from 28mobile.com, and they sent me a carrier branded SM-n910K, which by its specifications should work with Brazilian LTE (band 7 - 2600). However I am stuck on 3g. I was wondering if maybe the whole internet is wrong and this device doesnt support this band, or maybe its some sort of carrier lock. Also, how do i disable the awful branding, will flash a different firmware work and which do i flash?
Thanks
Click to expand...
Click to collapse
When you ordered the "U"-model, and got a branded "K"-model, I would complain to the shop you bought it and demand a swap to the model you ordered!

Why does my Note 3 show 4G with one SIM and 3G with another?

I have a Samsung Note 3 that I bought from Mobilicity (Canada).
It is unlocked.
When I put my Wind Mobility SIM card in, the data says 4G.
I want to give the phone to my sister, who broke hers, but she is with Rogers.
I put her Rogers SIM in my phone and everything works great.
But, I don't understand why the phone says 3G with her Rogers SIM in it.
Does anyone know why? I was under the impression that Rogers is faster than Wind's data. So how can Wind be 4G but Rogers 3G.
Both carriers have the same model number of the Note 3.

Wind has 4g? Maybe the Rogers card is not an LTE sim?

Could be any number of reasons:
- The provider isn't enabled for 4G in the Build.prop.
- The SIM is too old.
- The SIM doesn't support LTE
Probably the first. The list of 4G enabled providers rarely makes sense. It is literally just a matter of 'true' or 'false'.
We had a similar issue in the EU with various firmwares when 4G became available, every CSC has its own list of 4G enabled providers. For instance, DBT (Germany) had 4G enabled for T-Mobile NL, while the T-Mobile NL firmware didn't have 4G enabled for itself.

audit13 said:
Wind has 4g? Maybe the Rogers card is not an LTE sim?
Click to expand...
Click to collapse
Hmm... I'll ask my sister to check her SIM card. But I doubt they would have given her the wrong "new" SIM card that she just got.

If the Rogers sim card is new, it would be a LTE-enabled card so that can't be it. Also, Wind only has a 3g network.

audit13 said:
If the Rogers sim card is new, it would be a LTE-enabled card so that can't be it. Also, Wind only has a 3g network.
Click to expand...
Click to collapse
Okay... but like I said, when my Wind SIM is in, my Note 3 displays 4G.
When my sister's Rogers SIM is in, it shows 3G.

With the Wind sim, is it connected to the Wind network or is the phone roaming? Is the phone set to auto/LTE in settings? The phone is running a completely stock ROM? Phone is the sm-n900w8?

audit13 said:
With the Wind sim, is it connected to the Wind network or is the phone roaming? Is the phone set to auto/LTE in settings? The phone is running a completely stock ROM? Phone is the sm-n900w8?
Click to expand...
Click to collapse
It's connected to the Wind Network... it's not roaming.
Under "Network Mode" it says:
WCDMA/GSM (auto-connect).

Wcdma/gsm appears with the wind card or Rogers card?

I've seen Samsung phones with stock firmware incorrectly displaying 4G for Wind, even though Wind's network is 3G.
Sent from my LG-D801 using Tapatalk

aquatarkus said:
I've seen Samsung phones with stock firmware incorrectly displaying 4G for Wind, even though Wind's network is 3G.
Sent from my LG-D801 using Tapatalk
Click to expand...
Click to collapse
Wind is 4G.

Wind mobile has HSPA+ but friends that have their service usually get 3G.

audit13 said:
With the Wind sim, is it connected to the Wind network or is the phone roaming? Is the phone set to auto/LTE in settings? The phone is running a completely stock ROM? Phone is the sm-n900w8?
Click to expand...
Click to collapse
Okay thanks for this comment above. It was helpful because it got me searching for more along that line.
When I went into the settings, there was no option to choose LTE, but I know it's an LTE capable phone because the box said it was, and the sticker on the phone said 4G/LTE.
So I did some searching and found that there is a code that you have to use to set the phone to the Network you are using if you want to make use of the LTE.
Rogers has LTE.
I will go into a Rogers and ask them to do it, because I don't want to ruin my sister's phone (my phone that I gave to her, because her's broke).
It's *2012# (IMEI)* Something like that. I have it written down, so I'll bring it to the Rogers store and ask them.
Hopefully that will get her phone working on Rogers LTE, but in the meantime, she hasn't noticed a difference in data speed anyway.
But thanks for your help, and also to everyone else who posted a reply. :victory:

Have a similar thing going on with EE.
Supposed to choose 4g if available but it's not always the case.
Sometimes shows 3g or H+ but if I change my network mode to LTE only then I get 4g no problem.

MystaMagoo said:
Have a similar thing going on with EE.
Supposed to choose 4g if available but it's not always the case.
Sometimes shows 3g or H+ but if I change my network mode to LTE only then I get 4g no problem.
Click to expand...
Click to collapse
Oh okay thanks.

kat.hy said:
Oh okay thanks.
Click to expand...
Click to collapse
I choose LTE only by
settings
more networks
mobile networks
network mode
LTE only
your phones rom may be different?

MystaMagoo said:
I choose LTE only by
settings
more networks
mobile networks
network mode
LTE only
your phones rom may be different?
Click to expand...
Click to collapse
I don't have the phone anymore. My sister has it, so I can't check. She's technically challenged, so I wouldn't even be able to get that info from her on the phone. Lol
But I will see if I need to turn on the other bands by using that code to set it to Rogers' service.

How to enable GSM on GS7 (Smg930v)?

Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
the phone is gsm unlocked out of the box
my s7 is Verizon on att
flash the unlocked firmware to further unlock all the bands but Verizon unlocks out of the box
---------- Post added at 07:49 AM ---------- Previous post was at 07:47 AM ----------
PGHammer said:
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.
Click to expand...
Click to collapse
you do know that almost all Verizon phones now are unlocked out of the box no mods needed
the reason is some of the bands that gsm carriers are not supported by verzion
mine is a Verizon on att rite now no mods at all other than root and stuff
---------- Post added at 07:52 AM ---------- Previous post was at 07:49 AM ----------
rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
sorry for double posting kinda thing here
the reason its connecting to 4g there is the phone supports the 4g band obviously in brazil
but not some of the others I had this issue with my note 5 not supporting atts 4g band so I would get 2g and 3g but no 4g
again flash the g930u firmware and it seems to unlock all the bands
---------- Post added at 08:06 AM ---------- Previous post was at 07:52 AM ----------
rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
u might try in mobile networks to switch it to global instead of anything else

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
You should be able to put in the GSM sim and set the APN to what the carrier recommends and it works. It may not support all of bands that that carrier uses but it should work. You could also flash the Verizon SM-930v to the firmware for the Unlocked SM-930u via Odin and unlock more of the GSM bands. Most like it is just a APN issue
PGHammer said:
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.
Click to expand...
Click to collapse
You have no idea what you are talking about. All Verizon phones are sim unlocked and since the HTC Thunderbolt, they all support a lot but not all GSM bands. All newer Verizon phones are world phones and usually just need the proper APN of the Telecom being used. Again they do not support all GSM bands but the do cover a lot of them that are used internationally.

nrage23 said:
You should be able to put in the GSM sim and set the APN to what the carrier recommends and it works. It may not support all of bands that that carrier uses but it should work. You could also flash the Verizon SM-930v to the firmware for the Unlocked SM-930u via Odin and unlock more of the GSM bands. Most like it is just a APN issue
You have no idea what you are talking about. All Verizon phones are sim unlocked and since the HTC Thunderbolt, they all support a lot but not all GSM bands. All newer Verizon phones are world phones and usually just need the proper APN of the Telecom being used. Again they do not support all GSM bands but the do cover a lot of them that are used internationally.
Click to expand...
Click to collapse
I will second both of these post in every way. Lol. I was thinking it just tryin to keep to myself

Agreed. You could purchase the phone and flash the U firmware. That's what I have done. I have used my Verizon s7 on Att and TMobile through their mnvos respectively

To wrap up in a nutshell what everyone else was saying...
1) The G930V S7s have both CDMA and GSM radios, so will work on both types of network.
2) Verizon phones are NOT network locked.
3) You need to check the GSM frequencies for your local network. The G930V uses GSM 850/900/1800/1900 for 2G & UMTS 850/900/1900/2100 for 3G. If your local network doesn't use any of these bands, the phone won't work for calls/SMS.
4) Flashing the 'U' firmware will only add UMTS 1700. There used to be a way to get into the radio settings and add/remove frequencies using a service code, but I believe that Samsung have locked down that ability.

Great info
Great info!

Exynos on AT&T or T mobile

Does anybody use the exynos varient on AT&T or T-Mobile? I'm wondering if you get good service. I'm currently using an exynos S8+ on AT&T without any problems.

i had s9 duos exynos on att. excellent reception. im located in Boston.
Download speedtest to check your data/wifi speed

Thank you for the information. I looked up the S9 exinos on frequencycheck.com. It supports 3 out of the 4 4g bands on AT&T. According to the website the s10 exynos only supports 2 out of 4. So that doesn't help too much but I never thought about checking the s9 since I know it works well.

Works great for me. I got an Exynos from Australia when my phone died. Checked the bands for SM-G975F, and it has all the T-Mobile LTE bands EXCEPT band 71. So you will be good unless you go into rural USA.
Only thing I don't get is Carrier Aggregation. I have wifi calling and VOLTE..

Thank you for the info. After looking up that model it should work fine on both networks. That website I was using has wrong info on some of the models. I think I will buy the SM-G975F.

Wayneman101 said:
Thank you for the info. After looking up that model it should work fine on both networks. That website I was using has wrong info on some of the models. I think I will buy the SM-G975F.
Click to expand...
Click to collapse
I also have the G975 F(BTU - United Kingdom) I live in Milwaukee on ATT Network. I get great LTE Speeds - the only thing I don't get is Wifi Calling and ATT Video Calling - ATT only supports their phones for those features - at least until there is a custom CSC that we can flash (like someone did for the Note 9, S8Plus, etc)

Do you have VoLTE at least on AT&T with the exynos?

Geekser said:
I also have the G975 F(BTU - United Kingdom) I live in Milwaukee on ATT Network. I get great LTE Speeds - the only thing I don't get is Wifi Calling and ATT Video Calling - ATT only supports their phones for those features - at least until there is a custom CSC that we can flash (like someone did for the Note 9, S8Plus, etc)
Click to expand...
Click to collapse
Thank you for the info. I want to keep AT&T but I would switch to T-Mobile to get the exynos variant if needed. But I'm glad I can keep my service. I had the original IPhone and I'm grandfathered in to the original unlimited data plan. I didn't even know AT&T offered wifi calling. Before my exynos s8+ I had a note 4 and for about a year my moms extra free IPhone 6. It wasn't an option back then. I don't really care about WiFi calling though. I get good service where it matters most. I can't wait for S10+ Roms!

nismoxr34 said:
Works great for me. I got an Exynos from Australia when my phone died. Checked the bands for SM-G975F, and it has all the T-Mobile LTE bands EXCEPT band 71. So you will be good unless you go into rural USA.
Only thing I don't get is Carrier Aggregation. I have wifi calling and VOLTE..
Click to expand...
Click to collapse
I get limited carrier aggregation on my Exynos S10+ on T-mobile which helps a little. It still lacks the full CA support tho.

VICosPhi said:
I get limited carrier aggregation on my Exynos S10+ on T-mobile which helps a little. It still lacks the full CA support tho.
Click to expand...
Click to collapse
How do you check that? I check on my service menu and it says CA:None
I do see that I am sometimes connected to three of the same band at the same time.

nismoxr34 said:
How do you check that? I check on my service menu and it says CA:None
I do see that I am sometimes connected to three of the same band at the same time.
Click to expand...
Click to collapse
First you download a file or run speed test using speed test app, then at the same time dial *#0011# and select SIM slot it'll say CA added or CA active. This means you're getting some form of aggregation
Sent from my SM-G975F using Tapatalk

VICosPhi said:
First you download a file or run speed test using speed test app, then at the same time dial *#0011# and select SIM slot it'll say CA added or CA active. This means you're getting some form of aggregation
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
That's what I've been doing, but I don't see CA added or active. I wonder why mine doesn't even have CA on. Just CA none.

nismoxr34 said:
That's what I've been doing, but I don't see CA added or active. I wonder why mine doesn't even have CA on. Just CA none.
Click to expand...
Click to collapse
And you have the Exynos version correct? Try it in a different area away from your home and see if it activates. If nothing works, factory reset may help.
Sent from my SM-G975F using Tapatalk

VICosPhi said:
And you have the Exynos version correct? Try it in a different area away from your home and see if it activates. If nothing works, factory reset may help.
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
I am on Exynos, wouldn't have this problem with the SD version (I'd hope). I have factory reset a few times, but never see the CA as activated. I'll check from time to time, but also away from my house it doesn't show that CA is activated. Might be the XSF (australian) version that doesn't aggregate the t-mobile bands.

nismoxr34 said:
I am on Exynos, wouldn't have this problem with the SD version (I'd hope). I have factory reset a few times, but never see the CA as activated. I'll check from time to time, but also away from my house it doesn't show that CA is activated. Might be the XSF (australian) version that doesn't aggregate the t-mobile bands.
Click to expand...
Click to collapse
That could be it. I'm using TPA CSC and some other people on that CSC confirmed carrier aggregation working on T-mobile.
Snapdragon (Chinese or Hong Kong variant) does not support carrier aggregation in T-mobile from what a user posted.
Sent from my SM-G975F using Tapatalk

VICosPhi said:
That could be it. I'm using TPA CSC and some other people on that CSC confirmed carrier aggregation working on T-mobile.
Snapdragon (Chinese or Hong Kong variant) does not support carrier aggregation in T-mobile from what a user posted.
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
Do you have a link to the post where it is CA is confirmed on TMO?

For which model the Chinese Snapdragon?
CA is working for me on Exynos. It is not the same as US Snapdragon CA but still better than no CA at all
Sent from my SM-G975F using Tapatalk

Do you need to flash a CSC and/or modem from a US carrier onto an exynos international phone to get VoWIFI, CA, VoLTE, etc? Or does it "just work?" If you need a special CSC do you just pull HOME_CSC out of a US carrier's firmware and flash it with odin or something?

epv said:
Do you need to flash a CSC and/or modem from a US carrier onto an exynos international phone to get VoWIFI, CA, VoLTE, etc? Or does it "just work?" If you need a special CSC do you just pull HOME_CSC out of a US carrier's firmware and flash it with odin or something?
Click to expand...
Click to collapse
Hi
You should not flash any firmware from a Snapdragon into a Exynos..... You may not be able to get some of the service provider options using the Exynos firmware, i guess is a try and see situation, but one thing is for sure do not flash a Snapdragon firmware into an Exynos.
Everything else should work , modem is ready for all frequencies but CDMA

in case anyone comes looking, i've tried it on an exynos G973F with XSG csc (one of the OXM multi ones) just because that's what was on the phone.
VoLTE seems to be working on T-Mobile in the US without any messing around, based on the "HD" icon appearing during voice calls. Voice over WiFi seems to also work.
The phone is dual SIM with a TMO sim and an ATT sim. It doesn't get VoLTE on ATT, but I believe that's probably because AT&T only allows it on approved devices.

G975F/DS on Tmobile

I just bought this G975F/DS, seems to work just fine, but when I install my Tmobile SIM in the phone it doesn't connect to any networks. Are there settings I need to add/change? Anything?

Netconn said:
I just bought this G975F/DS, seems to work just fine, but when I install my Tmobile SIM in the phone it doesn't connect to any networks. Are there settings I need to add/change? Anything?
Click to expand...
Click to collapse
Check to see which bands are used in your area. If they primarily use band 71 then your SOL because that model doesn't support it.
Sent from my SM-G975U1 using XDA Labs

Netconn said:
I just bought this G975F/DS, seems to work just fine, but when I install my Tmobile SIM in the phone it doesn't connect to any networks. Are there settings I need to add/change? Anything?
Click to expand...
Click to collapse
Probably the access points need to be configured.
Sent from my SM-G975U using Tapatalk

When I inserted my T-Mobile SIM in the US unlocked S10+ for some reason the T-Mobile APN settings didn't autopopulate and I had to enter them manually.
Definitely look at your APN settings.

Well, it finally connected to Tmo but the reception isn't very good. My S7 and S5 pick up much better. Not that happy with it

Netconn said:
Well, it finally connected to Tmo but the reception isn't very good. My S7 and S5 pick up much better. Not that happy with it
Click to expand...
Click to collapse
Use an app like Cellular-Z to see what band each device is using. If the S7/S5 is using band 71 then you wont be able to get as good of coverage on the S10 because the international version doesn't support it.
Sent from my SM-G975U1 using XDA Labs

Netconn said:
Well, it finally connected to Tmo but the reception isn't very good. My S7 and S5 pick up much better. Not that happy with it
Click to expand...
Click to collapse
Did you actually check the APN settings on your S10+? If they are incorrect that would account for your poor reception.
It depends on where you live obviously but my phone never uses band 71 which I think is primarily for rural areas.
I've owned multiple unlocked phones that didn't support band 71 and have never had weak reception on T-Mobile anywhere I've gone.

I have the dual sim with T-Mobile and I actually didn't have to do anything. It worked out of the box.

Akujin said:
I have the dual sim with T-Mobile and I actually didn't have to do anything. It worked out of the box.
Click to expand...
Click to collapse
I haven't needed to manually enter APN settings on a phone in at least 5 years and I've owned a bunch of phones but for whatever reason the T-Mobile APN settings did not autopopulate on mine.
I have a single sim Snapdragon model--whether the T-Mobile settings autopopulate correctly might differ depending on the S10+ model and specific firmware the phone is running but it didn't seem like the OP actually checked his APN settings. I initially had a poor network connection because the settings on mine were not correct.
My reception was excellent after I manually entered the correct APN values and rebooted.

F models cannot do the proper Carrier Aggregation that TMO (and maybe ATT) uses to give their highest speeds and best signals.
While the Exynos models will work, if you have a USA based phone in the same spot you will find the speeds are much faster on the USA based phone than the Exy versions.
As of now, there is no way around this, people have been trying for years.