Partnerships rarely work out.

The interests of the two partners are never the same. One always has more intelligence and/or will work harder and longer hours than the other. This always leads to animosity which poisons the relationship and ultimately leads to a business loss.

You can try to talk to him, but the response is going to be:

"What's the big deal..........it's just a phone for my grandmother...........don't be so GD cheap...........grxbtgyhufkeirnm"