I have an unlimited data plan on my current iPhone 6. Another smart phone line was eligible for an upgrade so I upgrade it to the iPhone 6s. When the iPhone 6s arrived today I remove the sim and replaced it with my sim from my iPhone 6 and turn it on. It is now asking me to confirm the phone number for activation. The phone number it gives me is for the line I order the phone on? What do I do now? Do I activate it with the original sim for the other line and then after it is activated switch the sim? I want to keep my unlimited data. Thanks.