Hello,
I can build this simple presentation app for your company, the buttons will direct to the dialer exactly as you want.
Would like to have a chat with you, please contact me here anytime.
PS: We've just started this agency profile with 2 other friends, my old one with 5 star reviews is here: https://www.freelancer.com/u/Lynxu
Yours sincerely,
Florin Mihalache