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It looks like the Sprint Galaxy S7 edges are unable to take advantage of Voice over LTE or VoLTE. Without that option calls would be routed over the 2G/3G/4G networks, and LTE would only be available for data.
Unfortunately since those phones were not designed for use on the T-Mobile network, there is little T-Mobile can do to assist with making them work.
Thank you @thelimerunner for your response. I agree there is no way to get VoLTE on my phones. I will look for other Sprint/CDMA options. Boost mobile looks promising but will do enough research this time before switching to avoid the same experience again. Unfortunately, when I checked prior to switching over, I did give IMEI info and other details online and was told that these phones were compatible. A small note mentioning issues with CDMA phones especially when they see "Sprint" as my current provider may have helped me back then. Hope at least this discussion on the forum will help future potential customers take note and act accordingly (either get a new phone or not to switch using existing phone).
It is a compatibility issue, as mentioned by another on the forum. Basically the phone itself has the potential to work, but the software/firmware on it is the limiting factor. You can thank Sprint for that one. Your going to need a new phone that is ether Factory Unlocked from Samsung(US Varient) or just to buy a T-mobile branded device.
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The phones are compatiable with the network, they just won't work perfectly. They support LTE for data, and have the WCDMA/GSM (2G,3G,4G) fall back for voice and text. So they do work 0n the T-Mobile network, they just don't support all of the features properly, which is to be expected when using a phone designed for a different carriers network.
Yes got it. Thanks for the confirmation.
Hi, I found a reasonable solution in another thread in T-Mobile forums
where someone had a similar issue when they switched from att network.
There is this app available called 4G switcher. Just install the same and
it is very easy to switch between different network types without
restarting the device.
Like most of the time when I'm using phone for making and receiving calls
and texts set the network type to 'gsm only'. To use 4g internet, change
the setting to LTE/CDMA or any of the other LTE options. Once I'm done
using internet change the setting back to gsm only.
It all happens with just click of a button rather than the complex way of
going to settings->connections->mobile networks and changing the network
type there followed by restart of the phone every time the settings are
This app is very helpful and a very good alternate for people bringing out
of network phones to T-Mobile.
I just switched from Sprint and was able to connect my Samsung Edge S7 to T-MObile.
At first I had issues saying that my t-mobile sim was "not valid" sim card--This was after I ended SPrint service and called 4 representatives to confirm that my samsung s7 edge was UNLOCKED by sprint system.So I called Sprint and T-mobile again about why it won't accept my t-mobile sim (they kind of blamed the unlocking issue on eachother), and I even went to purchase an unlocking service which required me to download an unlocking file that was 2 GB large, but I chickened out thinking it was a scam- got my refund. I also rebooted my samsung edge 3 times. I even called different t-mobile stores to find out if anyone had the expertise to "flash" my phone or get my t mobile sim to work. I was told that my CDMA network (originally sprint) is not compatible with GSM network (t-mobile). Blah blah blah, whatever that meant, they were pretty much telling me that the way the phone was built was not compatible between carriers. So....
after looking at some forums for 4 hours, I followed these steps and then I was able to get my t-mobile sim to work on my former SPRINT samsung edge S7 phone:
go to SeTTINGS
Click on SYSTEM UPDATES
select UICC UNLOCK
after that, a message will pop up and say that the phone is unlocked and compatible with other UICC carriers. the phone should restart and your t-mobile mobile data bar should appear.
Hope that helps.