No connection in 2G

[Guest kipeti]

Hi everybody!

I have a problem. I hope you can help me.

I have just buy an Orage San Francisco on ebay.

The problem is, when i use the phone in 2G network, the signal is lost, and then phone is restarting.

I've tried different sim cards and different roms (2.1, 2.2)

Any ideas?

Thanks a lot!