keep old phone number on new contract

ddpea

hi
I wonder if anyone can help me
I took out an iPhone 5 contract with dialaphone thinking that I only had a few days left on my old contract - I was going to cancel the old one and just have the new iPhone 5 one
I now find that I have over a month on my old contract so I'm
now paying for 2 phones
as I had an iPhone 4 I couldn't put the old sim in the 5 as it is now teeny tiny for the 5
just wanted to know if it's possible for me to cancel the old contract when it expires but transfer my old number to the new contract.... I know it seems silly but I know I will never remember the new phone number and my old one is so easy!!
any help would be great
thanks xx

d123

If the 2 phones are on different networks, just obtain a PAC number from the old network and give it to the new network and the number will transfer next working day.

If they are on the same network, it's not as simple, people say O2 will arrange a number transfer on request, but most networks don't allow it. What you would have to do is get the PAC number for the old number, transfer it to a PAYG sim on another network and then get a second PAC number from the PAYG network and port it back into the new number account.