I might have fixed my phones data problem too. It looks like some settings for the internet app changed. I’m guessing it was from an update. It was restricting background data, which sounds good, but isn’t.
Since June 1st I’ve only been able to use 240mb of data. And that was at dial up speed.
I’d finally given in and started looking at new phones. I’m relieved I don’t have to get one yet.