[Yokuutsu]

Well, here, straight talk runs off of verizon and the phone I had when Pokemon Go came out....coould be updated to the bare minimum version of android it needed, but straight talk wouldn't allow updates, would not unlock the phone so I could attempt it on my own....and just thinking of calling their customer service/support makes me want to end myself. Literally.

Without wifi, I would not be on this website probably. Be we had internet before cell phones were a big thing at least. (And, with current rates, it is fairly cheap, and depending on your financial situation, well, one of my friends had okay internet form ATT for like 15 dollars I think? Dunno if you can afford that or if that offer or whatever he had is where you live...)

Still doesn't make sense why you need wifi....and Niantic....well it seems the only one to complain is on the actual app....

Anyway: you've probably tried all of these,but....if not...maybe it will help?

Check to see if Restrict Background App Data is on or not unther settings...if it is turn it off. Check for it on play store and play services as well (for some people, those being data restricted was the problem)

Or did you hit the cap before straight talk throttles you? (When I had them, I was always throttled...so slow. It was like back before any 3G) Or are they throttling you like they did me? D:

Another suggests turning off power saver mode if you have it (I assume it means on phone because if you can't log in, you can't get to the setting in the app)

In case a setting got messed up or whatever: another person had disabled Google Play Store from using background data when not on WiFi, and changing that got Pokemon Go to work for them, which Idek if you can do that with your phone....or mine either.

Another says reset app preferences in the settings I think? (Phone settings)

Most are talking about data and google play services, so maybe check that? On the off chance a setting got changed by accident, on purpose, or your phone just decided to change the setting>

Or maybe you tried all of them and yeah .-.