Does a pay-as-you-go SIM card work in a contract phone?

Answer

A pay-as-you-go SIM card is only usable in a contract phone that uses GSM technology and has been unlocked. To unlock a contract phone, you need the unlock code for your specific model.

Two types of cell phone technology are used by most cell phone service providers: Global System for Mobile Communication technology, or GSM, and Code Division Multiple Access, or CDMA. Cell phones that use CDMA technology cannot be unlocked. To unlock a GSM phone, the old SIM card should be replaced with the new pay-as-you-go SIM card. Some phones require that a numeric code be entered into the phone to complete the unlock process. This code is available from the original service provider or a third party.

Q&A Related to "Does a pay-as-you-go SIM card work in a contract..."
1. Take your SIM card out of its packaging but do not "punch" the card out of its holder. Your SIM card is set in a credit card sized holder; the information you will need
http://www.ehow.com/how_6402100_register-cingular-...
The arsoson why it won't work is that when you got your phone it amyt have already been unlocked but howeer 3 sims are special, special in sense that the phone has to originally on
http://wiki.answers.com/Q/Why_wont_my_3_contract_s...
http://ask.metafilter.com/138386... should help. Airtel is pretty good, but you'll have to walk into a store to find out if you can do data on a prepaid (to go) plan. More: http:/
http://www.quora.com/iPhone/Whats-the-best-pay-as-...
1. Decide what network you wish to be on (e. g, o2) and what tariff (e.g, o2 online) Enter this in the basic search box at the top of every eBay page. Ad. 2. Note the postage costs.
http://www.wikihow.com/Buy-Pay-As-You-Go-SIM-Cards...
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