I'd agree that phoning is the simplest method but I'm an emailer/texter simply because I'm rarely in a position to phone girls. I book well in advance though and if I don't get a reply, I just try the next one.
tcm
Am in a similar position (odd-working hours etc.) and most meetings are planned well in advance (prefer 1st-in-the-queue /weekends). Last minute is with someone I have already made contact with.
I follow a simple method:
English-as-First-Language (EFL) WG
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Initial email with Subject of Date/time/duration, Body with personalised brief complimentary? introduction followed by a line
******Ignore the following if you wish******
Which then includes quirky humour, odd dress requirements etc.
I find that this (if it is read) bypasses the daft phone selection process and a meet can be arranged. Possibly with brief phone followup
If it is read and not responded to (or the humour whistles over the head), then move on - a fuck is a fuck and if someone could not be arsed then....
Non-EFL WG
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Generally don't respond to emails or get "phone/txt me" but if they do respond with with a more than a one-liner, then that is a winner! and deserves serious attention
Mostly stick to txt as initial comms, with the usual date/time/duration