Fido, the Canadian cellular provider owned by Rogers Wireless, has begun selling “refreshed” iPhone 3G units to eligible customers. According to MoblieSyrup, the “refreshed” phones differ from normal refurbished units in that they are not rebuilt or reconditioned by Apple, instead being brought back to Fido during the 15-day return/exchange window, and carry only a six month warranty. The refreshed units can only be purchased…