[tonmoy]

Serious question, should I call 911 if someone is chocking and I don’t know what to do? Would the operator instruct me what to do over the phone?

[JD557]

While fortunately I never had to call 911, I'm pretty sure this should be the case. Whoever answers the phone should be ready to either give you immediate instructions (or transfer you to someone who can do that) until an ambulance/police arrives.

[BenjiWiebe]

Yes, you will be walked through first aid procedures while the ambulance is on the way.

[rado]

If 911 works with ambulances, yes.

[JohnFen]

Serious answer: yes.