is there a way to turn 2g iphone into kids phone

What do you mean "kid's phone" ?

Threre are some restrictions you can apply to youtube, safari and all.
And you can download games.

I guess this solves your question

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ash nazg thrakatulûk, agh burzum-ishi krimpatul


One Ring to rule them all, One Ring to find them,
One Ring to bring them all, and in the darkness bind them

i mean dial pad with predefined dial numbers, eg Dad, Mam

I've never seen anything that can do this kind of restriction

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iBlacklist has the Parental Conrol feature where it will simply block incomming and outgoing calls based on the active lists. If you just set a whitelist with Mom and Dad phones allowed, they won't be abled to call anyone besides Mom and Dad.

thanks alot