Arduino+GSM/GPRS+Relay - What to buy?

Hey,

I have been modifying a universal garage door opener (homelink) in a tesla, so that i can open my old garage door. This has actually succeeded :slight_smile: (not with arduino).

Now I want the ability to make 2 wires "touch" with a relay. (This activates the garage door remote).

I want to control this feature with my phone via sms (if it is possible to ALSO control it via GPRS/3g that would be great, especially via some available arduino app).

But main point, i want to control a relay with my phone and i want to do it via a sim card.
When it comes to the relay itself i want one that has 3 connections per relay (NO and NC).
(I would also like the ability to control it via Wifi or bluetooth, that would be nice to have but not a must, gsm on the other hand is a must).

What would you buy?

Thank you so much for your help, I have been wanting to do this for over a year, but i dont now what to buy so I have been postponing it / procrastinating it.