Had the same error message- SOS. Turns out, I had dropped my phone causong my SIM to move (slightly) up in the card slot. I pushed it down and EDGE was back. Lol. Good Luck
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Both my phones do the same thing when im in the house. It says searching for network and sos.. I walk outside and it goes right back to gprs ( dont get egde here). One phone is brand new and never has been dropped. Both sim cards are new too. I just thought it was a service issue since they work perfectly outside and it only happens at my home...no where else.
i'm hvin d same freaking problem...
initialization failed........ and SOS....
I even got a new sim card.... it ws working fine for some time... but again the same problem...