Alone time while the escort or the client is in the bathroom, taking a shower alone, etc.
I've done plenty of texting from the bathroom.
Client: "Hi, I saw your ad, I'll be in X from Wednesday to Friday? Will you be available?"
Escort: "When do you want to get together? What do you get into? Are you looking to host or travel?"
client: "Thursday at 2 P.M. Hotel X. I'm vers. I definitively want to flip".
Escort: "perfect, so far no plans. When will you check in at your hotel? Can you text me when you arrive?"
Client: "Sure. I'll text you when I get there. I hope to see you Thursday at 2."
Unfortunately it would take hours of texting to get something like this done.
In a couple of mins. call you can get so much done... but I've been told by escorts potential clients keep on claiming they don't have time to talk during work but they'll text their asses off.