I was on the pay-as-you-go plan, but jumped back to blackberry (various reasons). I kept my iPhone as expensive ipod. Noticed cracked screen last week, went to Apple store today and they gave me new iPhone. I went to iTunes to activate and now it says unable to activate, invalid mobile number and I must go to AT&T store. Surely they will activate even though I'm not using it as a phone? Any suggestions? Thanks.