what about this ""Priviyet, eta Iris. Kristjan doma?"" what tdk said?
Not at all. Privet can be addressed to a person you're familiar with enough to name him your buddy/friend. You should use "Dobry den'" (is the easiest to pronounce), Kristjan doma?

They will likely answer: "yeah" and go for him, but there're dumb people who answer "yeah" and wait for you to speak further. So you must know how to say "pozovite ego k telefonu" ("please" you may skip because it's hard to pronounce in Russian). They will absolutely understand you're a foreigner and won't pick at your manners.

hank you but I cannot get the pronunciation right since it's spoken very fast.
I'm sorry , I didn't think that was fast.
I'll record the phrases above slow and clear in a minute