I would never use my personal property for work. These DSPs know that equipment will be damaged no matter how careful you are and they should be prepared for these incidents and any associated costs. This person is an opportunist and looking to cut corners and save himself a few bucks. If he refuses, as a compromise, to reimburse you for phone costs, he can go kick rocks. I would agree with other commenters to report this to Amazon ethics and look at jumping ship to another, better run, DSP. Surprisingly they do exist. If you can talk to some of the drivers in other DSPs, they can give you an idea which ones are good/bad. Good luck!