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Old 06-02-2010, 08:59 AM   #4 (permalink)
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Join Date: May 2010
Model: 9700
Carrier: LuxGSM
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Aha, found the gremlin!

I discovered now that with unlocked phones, after upgrading, it overwrites the APN values (under advanced/tcp-ip) with the branded ones. So the T-Mobile APN settings came back when the device was upgraded. Once I disabled the APN or edited it back to my carrier, the wifi no longer crashes!
(note: if phone is simlocked, you cannot edit these APN settings, bastards!)

I discovered it while leaving my unbranded 9700 all night on wifi but no sim, but the second unlocked 9700 with wifi off with sim. Initially I thought maybe some app was flooding my router, but now it seems the T-mobile UK APN settings cause this issue.

So if someone encounters something similar than me, check the APN settings. And if you upgrade an unlocked phone, make sure to check/re-edit those APN settings !
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