[Noob question] bought unlocked Galaxy s4 - Galaxy S 4 Q&A, Help & Troubleshooting

hello all,
well i had my nexus 4 crap out on me over the weekend ( i am on tmobile). friend of a friend was selling an unlocked Galaxy S4 (SPH-L720). looks like it was originally a sprint phone. if i turn it off and then back on i get the sprint splash screen. it is running on 4.4.2 and everything is working fine and dandy. i have my t mobile sim card in it and it works --calls--emails--everything. i did have to download a voice mail app to get voice mail notification icon working but other than that- works great!
i did download an app to check check if it was rooted ( root basic i believe it was called). phone shows it wasnt rooted. which leads me to believe it was sim unlocked. i do apologize as i am a noob at this --- but does the phone need to be rooted to do this? also i highly doubt it was carrier unlocked--so my main question is --- if there is an android update in the near future and i do update -- will it brick the phone? are there any updates i should stay away from as to not mess the phone up as it works great for now.
thanks.

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[Q] ATT galaxy s4 radio call issues

Hi folks quick question just got the S4 and 3 sim cards later and 3 phones later the phone continues to suffer from dialing out issues it sits there saying dialing but nothing happens and it has all of its bars. took the sim and put it into a HTC One and LG Optimus Pro G and worked just fine no issues dialing or receiving calls but as soon as you put the sim back into the s4 the issues starts can't register on network, messages being delayed , folks going automatically to vmail call never comes through ATT says they have not had or heard of this issue has anyone here had this problem?? Thanks in advance everyone. Oh phone is stock rom att brand new not sure what to do.
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phonejunkie30 said:
Hi folks quick question just got the S4 and 3 sim cards later and 3 phones later the phone continues to suffer from dialing out issues it sits there saying dialing but nothing happens and it has all of its bars. took the sim and put it into a HTC One and LG Optimus Pro G and worked just fine no issues dialing or receiving calls but as soon as you put the sim back into the s4 the issues starts can't register on network, messages being delayed , folks going automatically to vmail call never comes through ATT says they have not had or heard of this issue has anyone here had this problem?? Thanks in advance everyone. Oh phone is stock rom att brand new not sure what to do.
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I'm confused are you saying three separate s4's are doing this or by 3 phones do you mean the s4, one, and optimus?
Sent from my WICKED AT&T S4
rcklss1 said:
I'm confused are you saying three separate s4's are doing this or by 3 phones do you mean the s4, one, and optimus?
Sent from my WICKED AT&T S4
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Okay 3 samsung s4's the original one , the refurb one they sent and the new one they sent out all have the same issue when you dial out it sits there saying dialing nothing happens.. if you take her sim out of the s4 and put in the HTC One it works no problem, put the sim in the LG OGP and it works just fine, put the sim in the LG Nexus 4 and works just fine also put her sim in nokia 920 and it worked just fine so my question is has anyone else seen these issues with the GS4 no dialing out, receiving text messages hours later, and constant phone not on registered network. And she had the s3 before this and had no problem and the store put 2 new sims in it.
phonejunkie30 said:
Okay 3 samsung s4's the original one , the refurb one they sent and the new one they sent out all have the same issue when you dial out it sits there saying dialing nothing happens.. if you take her sim out of the s4 and put in the HTC One it works no problem, put the sim in the LG OGP and it works just fine, put the sim in the LG Nexus 4 and works just fine also put her sim in nokia 920 and it worked just fine so my question is has anyone else seen these issues with the GS4 no dialing out, receiving text messages hours later, and constant phone not on registered network. And she had the s3 before this and had no problem and the store put 2 new sims in it.
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Ok just checking.. I haven't seen anybody else with similar issues.. I would go to the at&t store and talk to the manager or call customer service and talk to a supervisor.. Tell them you want an exchange done in store so that you can test it out before leaving... Or you want a different device.. Whichever you would prefer but no matter what I would do it in store so you know it works when you leave
Sent from my WICKED AT&T S4

[Q] PLEASE READ need help with carriers and stuff

Basically, I got a galaxy s5 on EE (a uk network) it was all good and fine until it got stolen, whoever took it knew what they were doing as I couldn't track it or look at any location history, they didn't get access to any of my stuff though thanks to my fingerprint but i'll get to the point.
my bank replaced it under home insurance (i wish they didn't) because they gave me a refurbished virgin mobile s5 and i'm with EE. so whenever I reset it on kies it installs all this virgin **** and different APN settings and so on. This has also now stopped me from getting any updates like lollipop, friends that have s5s all have it and i'm stuck on crappy kitkat with disgusting touchwiz. (i came from a nexus 5)
I went on sammobile.com and found an EE firmware (i tried putting a link in but it won't let me)
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Verizon Galaxy S5 no longer Unlocked after sending phone to Samsung for repair

Tl;dr: I recently sent my Verizon Galaxy S5 (SM-G900V) to Samsung to get repaired/looked at and after I got the phone back, it seems to no longer be an unlocked device, as it will not recognize my T-Mobile SIM card anymore.
After calling Samsung and waiting on hold for over an hour, I was told by a supervisor in Technical Support that Samsung does some sort of software flashing whenever they receive a phone to be worked on, and that this "software flash" must have caused the phone to lose its unlocked status. She also said that she has no idea how Verizon unlocks their phones, as Samsung phones are shipped out to Verizon as devices locked to only work with Verizon (or whichever carrier they are being sold to).
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Hello everybody
Recently received a Samsung Galaxy S5 originally from Verizon. The Phone works really well Outstanding performance ! but it has no service. Explanatio: I live in Cuba here the cellular operator is Cubacell operates on GSM. The phone finds the signal and notifies in "avaliable networks" tha Cubacel is Available... But fails registering on the network, and i don't know what to do... many technicians already "diagnose" the phone and most of them says is a problem qith QCN file, but what really worries me most is that Board IMEI is not the same the cell shows on *#06# .. so i found all these really tricky since i'm new in Android cause my previous phone was an HTC Windows Phone 8x that suddenly died and revived with no service either (a strange case for other post i hope) The S5 is SiM unlocked everybody says, besides every verizon phone is gsm unlocked by default don't they? The dark story of it is that the phone was previously unlocked for use in another company in the US and was working there perfectly. Right now the phone is running Lollipop, and no problems with WiFi restriction for Cuba so far... Registered on Samsung, on chat they send me to verizon saying phone is locked but i don't think thats the real problem...
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Phone Details:
Model SM-G900V Android 5.0 Baseband G900VVRU2BOK3
Kernel 3.4.0 Build LRX21T.G900VVRU2BOK3 Hardware G900V.00
Security MDF v1.1 release 4 VPN v1.4 release 4.1
KNOX 2.3 Configuration J13.SAM.SMG900V.1
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verizon samsung galaxy s5 voicemail icon not showing, using t-mobile network

Help please. I bought I verizon samsung galaxy s5 thinking that I could easily use it on t-mobiles network, obivously this is not the case. After much time and combing these forums i have been able to get everything to work except i don't get a voicemail notification anymore (i had previously called t-mobile and they had put in a ticket for it, it was working til last night). Does anyone know how to fix this? my phone is not rooted.
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