APPLE IPHONE 3G 16GB ON 02 NETWORK PAY AS YOU GO ?

APPLE IPHONE 3G 16GB ON 02 NETWORK PAY AS YOU GO. I HAVE HAD THIS PHONE QUITE AWHILE AND WORKS WELL BUT THE WIFI SIGNAL AS ALWAYS SEEMED QUITE WEAK, ITS OK IF IN NEXT ROOM OF ROUTER HOWEVER IF I GO UPSTAIRS IT DROPS WIFI SIGNAL QUITE ALOT BUT IT MAY BE THATS DUE TO ALOT OF METAL BEING PART OF THE HOUSE. COSMETICALLY ITS NOT BAD AT ALL BUT THERES A SMALL CRACK ON THE SIDE NEAR TO VOLUME BUTTON, DOES NOT AFFECT IT AT ALL BUT WORTH MENTIONING ALL THE SAME. IT HAS BEEN RESTORED TO FACTORY SETTINGS THIS MORNING AND IT COMES WITH PROTECTIVE CASE AND USB CHARGER CABLE 105.00 OR MAY SWAP