Its a bit like texting so look at an older style mobile
1-888-FACETIME
1-888 -
F=Press Number 3 Three times a press
A=Press Number 2 One Time
C=Press Number 2 Three Times
E=Press Number 3 Two Times
T=Press Number 8 One Time
I=Press Number 4 Three Times
M=Press Number 6 One Time
E=Press Number 3 Two Times
So the number you want is. 1-888 3332222338444633
Its a big Number but its how they work
You may have to try it a few times they dont always connect first time
Honest