Please help, iPhone is loosing carrier signal continuously
my iPhone was unlocked with anySIM 1.0.2 (at least, that's what I've found on iPhone's desktop, when I've bought it from ebay).
And this iPhone has problems with carrier signal.
--For 4-5 seconds carrier name (bite gsm, in lithuania), icon 'E' (for edge/gprs) is there and full signal is there and everything seems to be OK.
--Then after 5 seconds signal is gone, then 'E' is gone, then carrier name is gone, then the "no service" message shows up.
--After 4-5 seconds the carrier is back, signal is back, 'E' is back... and so on
--This routine never stops.
So... nobody can call me, I can call only when the carrier name and signal is there (but strange: if I make a call, I can talk all the time as long as I want to, everything's OK), and I can't send sms, I receive SMS's only when I'm talking on the iPhone (making a call to somebody).
Please help me, give some advice
P.S. I'm ready to donate, just help me somehow.