If you are in the business, communication is the only means of getting your business, it is incumbent on you to use reliable, clear communication tools, especially established well known providers charging decently for the hour ($250 and Upwards). Understand many providers use Metro and disposable phones, decent smart phones in either case is not that expensive any longer, so use it.
I have cheap phone, my call drops because of it is not an excuse.
I text to set up appointments with ATF. As matter of fact Text is is the only way we communicate these days. It is short and sweet and if both parties have seen and know each other what is the problem other than mythical beliefs?