Yes, a sim card is a memory card only used in cell phones. I f you were to use it in another carrier's phone, it might not work due to different companies, and how the phones work.
That depends on you ! If you're simply getting a new phone with the same carrier, and you want to keep your old number - simply put the SIM card from your old phone into the new one. If you want a...
No it wont... the blackberry service is registered to your sim card../number. it will... there are steps on how to do it... i'm still looking for it... i am able to activate my new sim with the same...