Pay to pay monthly sim

[Emmahatton]

Hi I have a 3 payg sim and got a new monthly sim with 3 I want to keep the old payg number 

[Geluk]

You have to leave 3 to achieve this, as you can't keep the number on a new 3 plan; once you've transferred back to 3 when your new [temporary] provider gives you a PAC code, 3 will accept it.