Would you look at that. Following in the footsteps of AT&T, O2 has today announced it'll allow current customers to pay off the remainder of their contracts at a discounted rate when they re-up with the network for the iPhone 4. Irrespective of how much you're paying now, the UK carrier will charge you a flat rate of £20 ($29) for each leftover month. Considering most iPhone users rock out at £30 and above, that's a solid 30 percent discount (or contract amnesty, however you wanna view it) for the impatient types. Of course, you'll be trading away your usual 14-day cooling off period if you take them up on this deal, so you'd better make doubly sure you want the iPhone 4 on O2 before taking the plunge.