Carphone warehouse have a deal on a microsoft lumia 640, but only if you have a o2 payg...vodafone freedom payg or virgin payg sim that has been topped up recently, if anyone could help me out with their sim number i would be very grateful. Many thanks

Are you expecting someone to give you their upgrade?

Could you not get your own SIM (free or £1) and top it up yourself with a few quid?

The T&Cs are quite clear.

Virgin Media upgrades:
It must be 6 months since joining Virgin Media or 6 months since last upgrade. Customer must have used number in the last 90 days to make a chargeable event.

Vodafone upgrades:
It must be 6 months since joining Vodafone or 6 months since last upgrade. Customer has made 2 chargeable events in the last 6 months and has applied at least £15 of chargeable top-ups in the last 6 calendar months.

O2 upgrades:
It must be 6 months since joining O2 or 6 months since last upgrade. A chargeable event must have occurred on the number at any time.

I used mine on the 530 and 635 deals over Christmas. Hopefully will be ready for the W10 handset deals next time round.