i have account for a blackberry with giffgaff and lost phone,i got new sim to go with new sony xperia phone, and sim doesn't work. giffgaff sent new sim for a friend and i have placed it in the phone and it is working, now i would like to remove blackberry account , and activate new giffgaff sim.new card wont activate because i already have an existing account, i also want to port my old o2 number( that i've been using) over to giffgaff.
why dont you sign into your old account (the blackberry one) and report the sim and phone lost. Giffgaff will block that phone and send you out a replacement sim with that old number on it. Then if you really wanted you could just port your o2 number onto that account.