1 hour of VoIP talk time uses approximately 144,000Kbits
- 400 gigabytes is 3,355,443,200 Kbits (kilobits)
- 3,355,443,200/144,000 = 23,302 hours
- 23,302 hours = 970 days
- 970 days = 2.66 years
So, to go over your monthly cap you'd need to do 2.66 years worth of calls in a month. To pull this off you'd need approximately 33 TekTalk services all on calls simultaneously and without pause for the entire month.
In short, TekTalk doesn't use up much of your data cap.