Do you mean a geographical number?

Can you give us some more information such as an address for this company?

Had a look at the sellfones site. Ridiculous amount of effort needed to find any form of contact other than email. Not even a land address, really a trustworthy site. But it does look like an affalliate of carphone warehouse.

confirmation is the returns page giving

Online Returns,
Transaction Ref: xxxxxxxx,
CPW Logistics Centre,
Bilston Rd,
Wednesbury,
West Midlands,
WS10 7JN                     no number listed


however, the registered contact, courtesy of bt is

D Lavender
TEL: 01691 670943
43 Smale Rse, Oswestry SY11 2YL