CAn u change networks and keep same number

[dominatrix1]

Anyone know is this is possible i want to change from orange to o2 but want to keep my current cumber to avoid all the hastle in changing it etc. anyone know if i can do this or do i have to stay with orange to keep the number

 

[dominatrix1]

does this cost anything

 

[dominatrix1]

im on pay as you go at the moment and moving to contracct