Hi Guys It seems O2 is suffering a lot with its 3G Network. Today I checked my iPhone and found out that there is No service. I tried reset also and found it is still not working. I put the sim into Nokia N81 8GB Mobile and found out there is no Network as well. After that I put the sim into O2 XDA Orbit and there was network. It seems that 3G Network is down. I turned 3G off in iphone and there is service again. Hope O2 is upgrading its network for better performance. Is there any one suffering from same problem. Regards.