Drop your existing contract to O2's lowest offering (I think about £7.50)

Take out a new contract with O2 for an orbit. You can get it free for £35
over 12 months from O2 shops (they also give you £30 for ANY old phone)

If your number is really important to you, just swap the sims from old to
new handset

It's about your cheapest option

The orbit is excellent and you won't regret it


Hays