This all depends on how long your into your contract if there's going to be an early termination fee or not.
If your at the end of your contract then phone 191 or use Live Chat and ask to move to payg. This takes 30 days to complete.
You'll retain your mobile number @Chriswat by using the keep-my-number process.
More information in >
How-do-I-switch-between-Pay-monthly-and-Pay-as-you-go.
Switching-from-Pay-Monthly-to-PAYG.
Current Phone >
Samsung Galaxy s²⁴ Ultra 512gb.
