SIM Frequently Asked Questions:

• Question:What is a SIM only deal?
  Answer:

  It's precisely because SIM only deals don't include a phone that they're usually a lot cheaper than standard mobile phone monthly contracts. A SIM card itself is a microchip around the size of a postage stamp holding all of a mobile phone's configuration information, for example the mobile phone number and call plan. Without a SIM card, a mobile phone will not work. Once a SIM card has been activated it is permanently locked to the particular network, though not locked to a particular phone. That means you can easily change mobile phone handsets but keep your phone number, your friends’ phone numbers and any saved messages or photos.
• Question:How does SIM only work?
  Answer:

  It's precisely because SIM only deals don't include a phone that they're usually a lot cheaper than standard mobile phone monthly contracts. A SIM card itself is a microchip around the size of a postage stamp holding all of a mobile phone's configuration information, for example the mobile phone number and call plan. Without a SIM card, a mobile phone will not work. Once a SIM card has been activated it is permanently locked to the particular network, though not locked to a particular phone. That means you can easily change mobile phone handsets but keep your phone number, your friends’ phone numbers and any saved messages or photos.
• Question:Why choose a SIM only deal?
  Answer:

  It's precisely because SIM only deals don't include a phone that they're usually a lot cheaper than standard mobile phone monthly contracts. A SIM card itself is a microchip around the size of a postage stamp holding all of a mobile phone's configuration information, for example the mobile phone number and call plan. Without a SIM card, a mobile phone will not work. Once a SIM card has been activated it is permanently locked to the particular network, though not locked to a particular phone. That means you can easily change mobile phone handsets but keep your phone number, your friends’ phone numbers and any saved messages or photos.