Will my iPhone 4 ask for another activation if I update to iOS 7?

Recently, my dad gave me his SIM-locked iPhone 4 because he had a new one. I inserted my SIM of the same network provider and it functioned well. When I did a full reset of the phone (which was iOS 6.1.3), it asked me for activation, so I had to borrow my dad's SIM. Now my phone's activated and is again functioning well.

If I update to iOS 7 after its official release, will it again ask me for another activation? I don't really want to give another problem to my dad.

You need to register the device's UDID with a developer account through a site like http://www.udid.in/.It's $5, and then you don't have to worry about activation issues.

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