Upgrading from 4.0.1 to 4.2.1 activation and other questions?
So around october last year I bought an iPhone 4 from a Guy who had bought it from ATT, it has
iOS 4.0.1, unlocked and jailbroken.
My question is:
Is upgrading from 4.0.1 worth the hassle? ( in my case).
I bought the phone whilst in the USA, now, i'm no longer in the US, so I don't have access to an ATT sim card.
My questions are
1. If I upgrade to 4.2.1 (without upgrading baseband obviously) can I use SAM activation to get around not having an official SIM for activation?
2. Can I use my countries official iPhone distributor ( Claro ) to activate the iPhone or is it dead locked to being only activated by an ATT sim card.
3. What other ways for updating iOS could I go for?
edit: 4. Currently push notifications work like a Charm, if I do any of the above, would I lose push notifications?