Received a call but nobody spoke to me for a minute. I hang up. It might be Telus Mobility as my account is past due.

It is telus collections department.

This is an outbound line only from the collections department of telus mobility

It probably is Telus collections since I got a call from them about 30 mins after paying my bill over the phone. They hung up as soon as I answered and didn't say anything. Hey Telus learn some phone etiquette

Yup, it's Telus, I am way past due and that makes sense. So confirmed, it's for past due accounts.

Also, they charge you interest if you miss the pay date, so you might as well wait till right before the next due date to pay up in full, they won't charge you any more interest until past that date, so why not just pay right before?  You've paid the interest on it.