shadow of my mind
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As long as the phones are compatible the SIM card can go into the phone and now that phones activity is billed through your account with the phone number. All billing is through the phone number. The older cell phones did not have SIM cards and the phone number was pre-programmed into the actual physical phone. If you wanted a new phone you had to take the actual phone to the store and they had to redo the new phone with your current number. My Norkia phone back in 1995 was like this. By 2000 my new phone had a SIM card and when I added two new phones to my plan in 2004 I took the new phones and used my old SIM card in them to transfer all of my numbers to the new phone and then cleared the old SIM card of information and placed them back in the old phones and sent them to my son and his wife to use while they where moving out of military housing so they could keep in touch until they caught the flight back home. The phone number and subsequent billing is attached to the SIM card not the physical phone itself. Personal at the stores tell you need to come in and inform them if you are getting a new phone but that is to get you in the store and sell you a phone. You can 'borrow' anyone's SIM card (as long as works with your phone) and any calls you make on it show up on that person's phone bill that the SIM card is registered with.
It is like you regular landline phone. You can move across the country with it, plug it into the wall and that phone is now connected to your number at that new location. The phone does not have a number, the line in your wall is connected to number the phone company has given it. Of course now you can take you cell phone number with you wherever you go. Landline numbers are portable only within a small geographical area and can be kept even if changing carries.
SIM Card – Short for Subscriber Identity Module. SIM cards are small removable smart cards that are used in many cell phones. SIM cards are used to store data like a customer’s mobile phone number and address book contact information.
SIM cards allow users to easily transport their phone numbers and contacts to new phones simply by removing the card from the old phone and inserting it in the new one.
Not all phones have SIM cards and some that have them do not allow users to remove them.
http://en.allexperts.com/q/Cellular-Phones-2768/2008/1/Sim-Card-Transferability.htm
Found this on a site asking a similar question. Portion of the answer
Your Sprint Blackberry 8830 does not use a SIM card in the US. If your Blackberry was an AT&T or T-Mobile one, then you could remove the SIM and put it in any AT&T branded or T-Mobile branded device (based on who your provider was) and it would work without issue. Hope this helps and please let me know if you need any additional information.
http://en.allexperts.com/q/Cellular-Phones-2768/2008/1/Sim-Card-Transferability.htm
This site has common abbreviations and explanations of what it means.
http://www.kuluttajavirasto.fi/Page/ad077ec2-ee02-4a84-852d-e938dd75b18a.aspx
It is like you regular landline phone. You can move across the country with it, plug it into the wall and that phone is now connected to your number at that new location. The phone does not have a number, the line in your wall is connected to number the phone company has given it. Of course now you can take you cell phone number with you wherever you go. Landline numbers are portable only within a small geographical area and can be kept even if changing carries.
SIM Card – Short for Subscriber Identity Module. SIM cards are small removable smart cards that are used in many cell phones. SIM cards are used to store data like a customer’s mobile phone number and address book contact information.
SIM cards allow users to easily transport their phone numbers and contacts to new phones simply by removing the card from the old phone and inserting it in the new one.
Not all phones have SIM cards and some that have them do not allow users to remove them.
http://en.allexperts.com/q/Cellular-Phones-2768/2008/1/Sim-Card-Transferability.htm
Found this on a site asking a similar question. Portion of the answer
Your Sprint Blackberry 8830 does not use a SIM card in the US. If your Blackberry was an AT&T or T-Mobile one, then you could remove the SIM and put it in any AT&T branded or T-Mobile branded device (based on who your provider was) and it would work without issue. Hope this helps and please let me know if you need any additional information.
http://en.allexperts.com/q/Cellular-Phones-2768/2008/1/Sim-Card-Transferability.htm
This site has common abbreviations and explanations of what it means.
http://www.kuluttajavirasto.fi/Page/ad077ec2-ee02-4a84-852d-e938dd75b18a.aspx