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It is the phone itself. SIM cards are peculiar to GSM phones. There are other types that do not use a SIM card. The SIM card carries information that is specific to the subscriber. All phones have operating software. Some of the software is common to all phones, regardless of who the carrier is. Some portions of the programming are reserved for the carrier. An example of this would be the banner the user sees when the phone is powering up, but there is a lot of programming that is transparent to the user, which is protected by the lock.

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โˆ™ 2006-02-04 17:12:18
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Q: When a phone is unlocked is it the card or the phone that is unlocked?
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How do you know if your phone is unlocked?

Try a sim card from a different carrier. If the phone works with the new sim card, then it's unlocked.


Can you use an ATT sim card in an unlocked GSM cell phone?

Yes you can! as long as the phone is unlocked any sim card will work in it :)


Will your vodafone sim card work on an unlocked Motorola phone?

If the phone is unlocked you should be able to put any type of sim card in there as long as it is a GSM phone with a sim card slot.


Can you use a sim card in an unlocked phone?

If the phone is unlocked you can use a sim card from any service provider, as long as the phone is built to take sim cards.


Can you put an att card in an unlocked tmobile sidekick?

You can put any SIM card in an unlocked cell phone.


Is there an easy way to find out whether or not the used cell phones I look at are unlocked?

Yes it is possible to see if your phone is unlocked. You can borrow a sim card from someone who has a cellphone with a different service company. If the card works and the phone thinks its your friends phone then your phone is unlocked.


Can you use a sim card from a prepaid phone and use it in a HTC desire unlocked phone?

Yes you can. If the handset s unlocked, it will accept any carrier's SIM card.


Will a SIM card for a pre-existing phone work in unlocked phones?

There should be no problem if you use a SIM card in an unlocked phone. If the phone is locked make sure the network is available to you.


what unlocked phones can be used with an ATT account We need to replace an ATT phone, don't want to pay retail for a new phone and aren't ready to renew the 2 year contract?

An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.


Can you use a nokia sim card with a Motorola phone if the phone is unlocked?

If both the SIM you want to use and the phone you want to use it on are unlocked, then this is possible.


Will an unlocked Sidekick cell phone need a SIM card to work?

Any cell phone that is unlocked requires a SIM card to work. If you own a Sidekick cell phone that is unlocked you are able to use a carrier other than T-Mobile. For this reason, it will require a SIM card to work.


Does an unlocked phone mean its used?

For a cell phone to be unlocked, it means that the phone is able to use any SIM card from any phone network type. For example, a locked Verizon Wireless phone would be unable to accept and function with an AT&T SIM card, whilst an unlocked Verizon Wireless phone would be able to accept and function with an AT&T SIM card.


Can an unlocked mobile phone take a tesco mobile sim card?

Yes, An "Unlocked" Phone means you can put ANY operator ("Orange", "Vodafone" etc) SIM card in it.


Can you use a fido sim card with a rogars phone?

Nope unless your phone is unlocked from fido.. You can get your phone unlocked from any vendors online like Unlocking4u.com


Can you put an at and t contract Sim card in a net ten prepaid phone?

If the net 10 phone is "unlocked" and the sim card fits. Usually the phone needs to be unlocked network wise not pin wise.


Can you text on an unlocked phone out of the US?

If you have a SIM Card, then yes.


Would a centennial wireless sim card work in a at and t phone?

If the phone is unlocked it can be.


Can a TracFone SIM card be used in a NET10 phone?

If the NET phone is unlocked, yes.


Can you use a SIM card from a Dominican Republic phone company in an unlocked iphone3?

Yes, if unlocked you can use it.


I just unlocked my phone. and put an optus sim in it to make sure it was unlocked. will the phone be locked to optus now?

No - the phone is the item unlocked - not the SIM card. If you were to replace the Optus SIM card with (for example) a T-mobile SIM - it would register to T-mobile. You could swap the SIM card back with the Optus card, and still use it.


Can an ATT sim card be used on a telcel phone?

yes if your phone is unlocked from china or hong kong or an american att or tmobil services...(Unlocked)


Can you transfer a SIM card into any phone?

Only if the SIM card has been unlocked first.


Can AT and T Go Phone SIM cards be used in unlocked cell phones?

Hi, yes a at&t Sim card will work on any unlocked phone


What is a unlocked cell phone?

An unlocked cell phone is a phone that is unlocked! HaHahaHaHaHa


Is it possible to use a prepaid Cingular Sim card in a Razor phone?

Yes if your Razr is from Cingular or unlocked. You can not use a T-Mobile Razor with Cingular prepaid sim card or Globaltravellersim prepaid international sim card unless your phone is unlocked.