British iPhone users, who bought the Apple phones when they went on sale in England on Nov. 9, are reporting persistent problems with signal strength on O2, the UK's only iPhone service provider. The complaints started only 2 days later. InfoWeek blogger Alex Wolfe says there's a debate as to whether O2 or the iPhone is at fault; it appears to be the handset, which is unusual since US users haven't reported similar problems. Some 02 customers report that getting a replacement phone fixes things; others have had to do a software restore back to version 1.1.2 of the iPhone software