I'd say a good lot take their phones with them....

Flush with foot

Do not wash their hands.

Wash their hands. I hope I;m wrong. :-)))

read or use phone.

Leave the door open

Pet your cat/dog.

I deleted my entry as I was thinking a public washroom, it just says washroom.

I will say talk on the phone.

Check their rear view in the mirror before exiting.

Combs hair.

Hover....you know what I mean! :-D

Tells whoever they are with where they are going.

Rusty

Peek into the cabinet?

Good catch georgysmom2- in light of re-reading the question, I will now revise my answer to "announce where they are going" I say this as my husband likes to make this announcement, lol

Read

I just saw Georgysmom's comment. No, it has nothing to do with doing something before you 'go' to the washroom. I don't know why it's worded that way.

It can be either in a public or private washroom, btw.

fix our hair