Apple iphone 3gs 16gb on O2 or giffgaff ?

iPhone 3GS 16GB in White on O2. Condition is very good with some general wear. The screen is free of scratches as always had screen protector. The chrome trim has some marks from the case and a scuff at bottom. The rear casing has some general light marks and a very small crack at the bottom charging point. The phone is locked to O2 or giffgaff which uses the 02 network. Phone will be restored to factory settings.Comes with genuine apple charger. Cash on collection. Price negotiable. Please call or text Stephanie on 07905606993