I've got a SIM from the old Omnipoint days.

It's working fine with one key exception:

   It only holds a small number of phone
   numbers in its memory.

So at present, some of the names/numbers are
stored on teh SIM, while others are in
the phone itself.

I take it a new SIM will have more memory
for such things, so everything can be stored
on the chip (and moved from phone to phone).

First, is this correct?

Second, can I just get a new SIM over the
counter at a t-mobile store and have them
activate it, there, with the old number?

and ...

Third, can they do a data dump from the
old SIM to the new one, or do I have to do
a one-by-one manual transfer to the phone
and then to the new SIM?

(Other suggestions about the transfer
cheerfully accepted).

Thanks