I was wondering if I can activate a 5S iPhone without the phone with me? I plan on walking into an ATT Store today with only an ATT sim card and the IMEI number. Also, would I be able to port an active number from T-Mobile which is activated on one of their pre-pay plans? The monthly plan ends tomorrow, the 15th. Should I wait after the 15th. to do this? I was told by an ATT manager that an account number was required to port a number over, but when I check the pre-pay receipts I was given by T-Mobile, there was no account number to be found. I wouldn't think a pre-pay plan would be designated an acct.# since people on these plans come and go. Thought? Thanks.