I was in Europe for 2 months this past summer, and since returning to NYC in September, my Samsung mobile data has been stuck in E (2G). I have full bars, I am in the city so coverage is not an issue, I have tried all troubleshooting steps given to me by my service provider, I even switched service providers (from Google Fi to T-mobile), and I factory reset my phone. And IT IS STILL STUCK ON E. One weekend I went out of the city and I got 4g for a few minutes but do not know how that factors in. Pls help.