I have an iPhone 4 with an unlimited data plan and I think it might be time to get a new phone finally. I was considering trading in my 4 for the $200 credit towards a 6. I would like to know if there is a way to keep my unlimited data besides paying full price for a new phone. We have 5 phones on the account and 3 have upgrades, including an upgrade on my line. Would I be able to use one of the other upgrades and somehow keep my unlimited data? Obviously my iPhone 4 has no SIM card so I can't just transfer that into the new phone.
Phones with account:
Regular phone
iPhone 5s with 2GB data
iPhone 4s with 2GB(available for upgrade)
Regular phone(available for upgrade)
Iphone 4 UD(upgrade available)
If anyone knows what I could do to keep unlimited data on my line without buying the phone for the full price I would appreciate any help! Would I just have to activate the phone on the other iphone line with an upgrade and then movie it?