Just started this morning... even though it's showing 3G with 4 bars, no data transferring to my phone at all. Works fine with Wi-Fi, but not over cellular.
I've tried powering down and up, taking the SIM card in and out, but no joy. Still no data except over wi-fi. Really don't want to have to resort to a hard reset.
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Here's what temporarily fixed it for me..
1 - Turn off the phone
2 - Remove sim card
3 - Turn on the phone
4- Wait for phone to be fully booted
5 - Turn it off again
6 - Re-insert Sim card
7 - Power on the phone.
I've had data for about 2 days solidly now.
above could be YMMV .. for me i simply turn of the phone and wont touch it for 10min exact .. when i turn on issue is gone .. try that as well ..