Calls to standard UK 02 numbers vary with Three Mobile, depending on whether you have a monthly contract or pay as you go phone. Calling 02 numbers is usually included in your monthly allowance of free calls with Three Mobile. However, if you use all of your inclusive free minutes on your monthly contract phone, there will be call charges for calling 02 numbers.
For calls outside of your inclusive monthly allowance on Three Mobile, the cost will vary depending on what plan you are on. For customers on the Advanced and Essential Plan, the cost to call 02 numbers if you are calling from within the UK is 35p per minute. For pay as you go customers, the price of calling UK 02 numbers from within the UK is just 3p per minute.