Debating the great question, whether to switch from Verizon to AT&T for the iPhone 4? I'll be relocating to Los Angeles shortly, mainly to the Santa Monica area. Just wondering how the coverage, call quality, signal strength inside of buildings, ect are with AT&T? I've mainly been on blackberry's, but I'm a Mac user and looking for something other than a blackberry. Most everyone I know in Los Angeles is on Verizon and uses a blackberry, so they're telling me to stick with Verizon. So any input/help would be appreciated. Thank you.