ALL mobiles need a SIM card in order to make & receive calls. An unlocked hone has simply been released by the original network provider in readiness for someone to put a different company's SIM card in it. Relating to your question, the phone has been unlocked, but the seller has left their original SIM card in it. You have the choice of either using their SIM card or inserting your own.
SIM free - means the phone is supplied 'unlocked' - in that it is not tied to a specific network when you buy it. The phone will work with any inserted SIM card - without having to get it unlocked by your current service provider first.
If both the SIM you want to use and the phone you want to use it on are unlocked, then this is possible.
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.
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.
A sim free mobile is a mobile phone that can be bought which is unlocked to any network. i.e: can be used on any network, and not specifically one eg; o2. ~ AshJordan
if the phone is unlocked
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.
The 5" unlocked dual Sim phone was released in the 2000s. Unfortunately, a screenshot cannot be taken on a 5" unlocked dual Sim phone. The only way to get a screenshot is by downloading the screenshot.
Hi, yes a at&t Sim card will work on any unlocked phone
Yes, provided your ATT phone is SIM unlocked.
you have to get your phone unlocked to change your sim on your phone .you need to google "restriction code "and then your the model of your phone
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.