Apple iPhone 4 Unlocked 16GB Black Boxed with Charger Excellent Condition - Has Reception Issue -

Hi I have my Apple iPhone 4 16GB for sale. It is unlocked for use on any network and comes boxed, complete with charger, user guide etc. The phone has been restored to original factory settings, is in great condition and fully functional with the exception of an intermittent reception problem. The reception signal seems to go up and down every so often from full strength to no reception and back up right away. Not sure what has caused the fault but someone with a bit of knowledge may be able to fix it. Otherwise, the phone is fully functional. All applications and functionality of the phone work perfectly and data transfer etc is perfect when connected to wifi. Any questions, please ask. No time wasters please. Thanks for looking!