If your existing number is important to you and you would like to transfer ('Port') it to your new mobile phone and network provider, the following is a clear guide to make this a stress-free process.
As long as you've fulfilled your contractual obligations (usually a 12 month contract) to your existing Network or Service Provider then you can port your existing number to a different Network.
With a pay monthly mobile phone you can ask for your Porting Authorisation Code (' PAC') from your current Network or Service Provider. The code is normally made up of three letters and six numbers and some Networks charge a small administration fee.
Do not cancel your existing contract as disconnected numbers cannot subsequently be transferred. By providing your PAC number to your new chosen network this will initiate the cancellation process with your current network.
To port your number there may be a small administration charge from your current network and we advise you to check this one out first.