When you are buying the iPhones in bulk, it will be time spent to inspect the device one by one in human, however, the time-consuming process may impact your business. As a result, you either invest in a cell phone diagnostic software and make sure every iPhone you purchase in bulk lot passed the diagnosis test or you should locate an iPhone wholesaler, such as wakephone.com which has checked all the devices on behalf of you before shipping out the iPhone lot. wakephone.com use PhoneCheck Pro diagnosis software to check dozens of checkpoints, printing out a certificate for every iPhone they sold. They will even do the factory resets and completely clear out the phone, checking the IMEI, making it good and safe for you to resale. This will save you valuable time and money.