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pay as you go definitely. Contract is a trap.
More People Go To Pay As You Go
A bus pay is when you pay to go on the bus.
If you do not Pay as you go, So if you top up your phone you are on pay as you go or if you have a bank account linked to it you are on pay Monthly.
The phones themselves can be either contract or pay as you go, the sim card determines whether it's pay as you go or not.