Hello, My name is Daniel and i need advice on some stuff. I was wondering do you think starting a Smart Phone Repair Business where i come to the home/business of the customer, look at the Smart Phone that needs to be repair and see if it can be repaired On-Site without needing any parts so i'll just repair it there at there home/business then charge a fee. But if the Smart Phone can't be repair On-site and needs parts that i don't have on hand for EX. A Smart Phone Screen. Then i take the phone back with me. Then i'll give them the price for the part and they pay for it then after that i'll leave a sign agreement with them signing it also saying that "I will return the phone back after the repairs have been done and after every thing checks out and is OK they must pay . After i finish the repairs and bring it back they will check it out and then they pay for my services fee.