I believe it is possible for the 4S because it has GSM (AT&T) and CDMA (Verizon and Sprint) antennas built into it.
No - the new service provider would supply a SIM with their new account information on it.
No you will not lose any info stored on the original iphone, as long as you create a back up in iTunes. When you use the new iPhone be sure to Restore From Backup.
Of course, the iPhone 3G and/or the original iPhone will take any normal sim card; the 3G iPhone will take the 3G sim as well.
Only if the iphone is a GSM phone with a SIM card... Otherwise if it is CDMA then no, you have to activate the other iphone.
Switch on! With your local SIM card and don't forget to charge the phone.
You can use the SIM Card method for GSM carriers, or find a way to switch plans with the dual-antenna iPhone 4S.
Try inserting a different memory card (that you know is working. If you still get the same message - the Iphone is faulty. If, however the new card works, then the original card is faulty.
it depends where yo buy it like att or virizon but if you want it for a diffrent carrier than the original you will have to visit unlockatt.com
the iphone has a sim card which slots in the top of the iphone. to get the sim card tray out you have to use a pin or the special tool it came with to open it.
It depends if the original phone the SIM card belonged to was saving them to the SIM card itself. Here's some clarification: The SIM card will retain contacts from a previous phone. The iPhone will not recognize SIM contacts until they are imported to the Contact list via Settings > Mail, Contacts, Calendars > Import SIM Contacts The iPhone does not save contacts to the SIM card, and therefore if the SIM is from an old iPhone there won't be any SIM contacts present.
To refine that answer it's not possible to attach a credit card machine to a Iphone. There is a application for the Iphone where you can accept Credit Card payments. The application is called processaway, and you can accept credit cardsanywhere, anyplace, anytime on your internet connected iPhone. Never pass on a charge only opportunity or sale again!
Credit card issuers sometimes offer cash rewards to encourage customers to switch to their services. there are also a number of credit card providers that offer rewards via cash-back on purchases. Some of these providers are American Express, Santander and Barclaycard.
Yes the iPhone uses sim cards. Depending on the iPhone you want to put your sim in. If its the original - the 3gs yes but the iPhone 4 or 4s not. Side note, you may not get all services because you need to add a data plan.