Disable Wifi.
Disable 3g.
count to 5.
enable 3g.
enable wifi.
profit.
Not all of the above steps may be necessary (usually ticking wifi off and back on works for me.)
This is a problem i've had as well, for pretty much any cm7 or miui build. But it doesn't seem like it happens to everyone. Is there something wrong with my phone or is this a common bug?
The wifi on off trick usually works for me too. I'm on 11.8 or whatever it is and glitch 12
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