The telephone number 0208 0926684 operates as part of a scam network calling unsuspecting UK mobiles and pretending to be selling mobile phones.
Of course there are no mobile phones for sale, what they really want is you to connect to their scam line. In fact all they have to offer is fraudulently obtain your personal details for their nefarious use. Instructions from the number 0208 092 6684 are to press 1 where you will be connected to a scam call centre in India.
If you phone back you will receive instructions to provide personal details including your bank sort and account. Please do not answer any calls from this number and, of course, do not provide details. Beware of this number.