No Phone Connection - Help - 8125, K-JAM, P4300, MDA Vario General

I have bought a T-Mobile MDA Vario. I did not have a T-Mobile SIM card, so I did a SIM unlock and CID unlock.
It now accepts other SIM Cards but it keeps saying it is searching for a network but cannot find one.
I tried updating the ROM to the Molski one but it still will not find a network.
I have tried an O2 SIM Card and a TESCO SIM card.
Can anyone help??

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Why my Qteks200 can't read any SIM card?

My Qteks200 can't read any sim card. I tried to uncolck it with Lokiwiz03 & Lokiwiz03a but there was no change! when I insert any sim card it say: ' Invalid or Missing Sim card'. Please help me! What should I do?!
Normally QTEK's are NOT SIM Locked as they are not sold thru any Phone Provider.
Maybe your SIM is infact invalid? In other phones as well?
Or i have heard that like in Dubai, some phones are locked by the seller to be used only in their language/country's SIM.
Have you tried asking the place where you bought it from?

My qtek s200 don´t recognize others sim cards

my qtek s200 don´t recognize others sim cards, only recognize mine.
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Help : Changed sim card reader but sim card error

Hi. One time ive damaged my sim card reader pins, :crying:
I'm living in poland so i had to order sim card reader from Italy, our service doesnt have any spare parts for this model
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Dont know whats wrong. Can anyone help me ?
Reflash rom doesnt make any difference,
diagnosis all (network etc.) is disabled
SIM CARD READER has simlock ?

[Q] Second SIM Card Issue Please help

My friend have bought S3 Neo 3 days before - in which the second sim card slot is not working. The sim card status in sim card manager saying No Network Card
Refer the screenshot below.
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[Q] Invalid SIM Card

My device is i9505 and it should be carrier unlocked, I bought it outside any carrier.
I have this device since mid 2013, with the same carrier and same SIM Card.
I only had 3G, and my SIM Card only supported 4G
Recently I noticed that they don't work anymore with just 3G, everyone with compatible device and SIM Card could use 4G
So I went to my carrier, and bought 4G SIM Card, it's from the same carrier I used for the last 3 years
But when I tried using it, my device said "Invalid SIM Card"...
I asked them to try the SIM Card on one of their devices, and the SIM Card worked, but on my i9505 it says "Invalid SIM Card"
I tested with my old SIM Card, and the device found no problem, but when you get a new SIM Card the old is blocked, the device recognized the old SIM Card but I can't make calls, receive calls, etc, etc...
As using my old SIM it still recognizes, I think it probably isn't a hardware problem...
Does anyone knows what could be causing this, and is it possible to fix?
I'm currently using Imperium LL v13 (Custom ROM)
I tried flashing a newer modem from my carrier based on this firmware:
http://www.sammobile.com/firmwares/download/48432/I9505VJUHOD2_I9505ZTRHOD2_ZTR/
I downloaded the modem from this post:
http://forum.xda-developers.com/showthread.php?p=61852508#post61852508
But it still says "Invalid SIM Card"
I also tested SIM Cards from some friends that use other carriers, these SIMs worked on my phone, and my SIM worked on all my friends phones, but when I try my SIM on my phone, it doesn't work...
On the screenshot below you can see my baseband version after flashing the newer modem:
https://hostr.co/file/bAGsLWMm8SJ1/Screenshot_2016-07-14-17-12-31.png
Below you can see the Invalid SIM Card message:
https://hostr.co/file/Etxov8AOmesF/Screenshot_2016-07-14-17-12-41.png
Network status using my SIM on my device
https://hostr.co/file/RfwMx61CqvzZ/Screenshot_2016-07-14-17-22-34.png
Network status using one of my friends SIM Card on my device
https://hostr.co/file/3xB6y6bAN8QI/Screenshot_2016-07-14-17-31-10.png
Network status using another SIM Card from another carrier on my device
https://hostr.co/file/QhT4WI5deWyq/Screenshot_2016-07-14-17-17-53.png
Network status using my SIM Card on my friends device
https://hostr.co/file/lQh4YtFf2LxF/WhatsApp-Image-20160714.jpeg
I had the same exact problem with my I9505 with my operator digitel ( venezuela) , the only solution i had was to ask them for another type of sim card
So it turns out that Lossadax was probably right, the store that I went probably had a type of sim card that wasn't compatible or they had defective sim cards there
I had to buy another sim card from another store, the connector had different size and layout, and now it's working!

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