I had a similar situation with a recently unlocked AT&T Samsung S7 (Model: SM-G930AZDAATT) on Android 7.0. When I initially inserted the nano SIM card the mobile network worked just fine (I was even able to use the phone as a mobile hotspot for my laptop), but suddenly the mobile data didn't work. Long story short here is what I did.I went to Settings --> Connections --> Mobile networks --> Access Point Names, pressed the three dots on the top right, and selected "Reset to default." The phone did its thing and then a bunch of APNs showed up (I had originally deleted all APNs except the T-mobile APN). One of those APNs was called "T-Mobile GPRS" and it had "fast.t-mobile.com" underneath it. I selected it and in the "Edit Access Point" screen I changed the "Name" from "T-Mobile GPRS" to "T-Mobile." Then, under "MMSC" I typed "http://mms.msg.eng.t-mobile.com/mms/wapenc". Next, under "APN type" I changed the text from "default,supl" to "default,supl,mms". Finally, I pressed th
In hindsight, I unwisely rebooted my phone because after the reboot the mobile data stopped working. I tried many times what I wrote previous post and didn't work. I even tried the APN settings from my wife's [I can truly related to "happy wife, happy life"] phone (an unlocked Moto G4 Plus I got her from Best Buy) and my unlocked Nexus 5 APN settings, and every time I changed the APN settings I rebooted the phone as instructed (suggested?) in T-Mobile's Generic data settings support page with no success.Here is what I did. I set the APN settings for the S7 to be equal to those of my Nexus 5 (which turned out to be the same as those I posted on May 23), did not reboot the S7, removed the SIM card from the S7, and inserted the SIM card into the Nexus 5 (the Nexus 5 was already powered on). The mobile data worked just fine on the Nexus 5 which ruled out that something was wrong with the SIM card. I removed the SIM card from the Nexus 5 and inserted the SIM card into the S7, but did not re
@gunn317 the mobile data in the S7 has been working since I recommended the fix, but I still have the issue after the reboot as detailed below. This gave me the chance to test the fix I recommended.On June 4, I rebooted the S7 (because I wasn't receiving text messages) and, as expected, the mobile data didn't work. I waited until the "4G LTE" symbol appeared on the status bar, removed the SIM card, and inserted it back without rebooting the phone. It took a couple of attempts, but it got the mobile data working again and has been working since then (I haven't rebooted the phone since June 4).
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