Where contacts info kept ?. trying to board an inflatable...

i killed iphone 3g ( trying board inflatable boat in long beach, ca - salt water ! ).
so, put att sim card in generic unlocked gsm phone.
immediately, got text message unknown number , looks scrambled, presumably att.
strange thing:
got contacts including ones have deleted long long time ago !!!.
these historical contacts downloaded att because see new phone on sim card ? .... or these kept in sim ???.

biggie question:
should wait 5 ??????.
in dillema. hoping bypass 4s because heard 5 have 4 inch screen.

 

fwiw, iphone doesn't store contact info on sim.

 

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