In order to use OneSimCard global SIM services you require an unlocked GSM phone. If your phone is locked then you will need to unlock it. Many domestic mobile carriers put a software lock on the cell phone they sell to make sure that you can not use other service providers.
What is Cell Phone Unlocking?
Cell phone unlocking is simply the removal of any network or carrier restrictions on your phone allowing it to be used with any GSM SIM card. The unlocking procedure requires a small change of the cell phone software, so the phone will accept other providers SIM cards. Usually this just means entering a simple code into your phone.
How do I Unlock my Phone?
Most mobile phones can be unlocked remotely. To unlock your phone you need to either call your service provider and ask for an unlock code, or if using a third party service provide them with your IMEI number (15 digit phone serial code). The unlocking company then generates a unique unlock code just for your phone. They also send detailed instructions as to how to enter the code which are simple and easy to use.
Once you enter the code successfully your phone will be unlocked forever allowing you the freedom to use your phone as you wish.
How much does it cost?
Your domestic provider will usually do this for free, otherwise most unlock codes vary from $12-$30 and are generated within one day. These unlock codes are all genuine manufacturer authorized unlock codes and come with a full money back guarantee.