I just purchased a used Thunderbolt to get me through the next couple of months until the iPhone 5 comes out. I "upgraded" from my Droid X, which I loved, simply because I wanted to try the 4G and the X was just getting old and had quite a bit of lag.
I like the Thunderbolt so far, but have a simple question. The first night I had it, it was on 4G. But that night before I went to bed I hit the "Enable power efficiency" button under the Power tab. That said it would take it off 4G because of the batter drain, etc. I have since turned this off because I wanted the 4G during the day. However, I have not gotten any 4G service over the past two days.
Is there a reason the 4G is not coming on now? I have restarted the phone, etc.
Thanks for the help.
Have you checked your network mode? Settings > Wireless & networks > mobile networks > network mode
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