What does TXT/I'm to International Overage mean?

Because last Thursday we bought an iPhone and had a data plan of 1gb. Then after setting it up, I texted my friend in Canada but he don't use an iphone though. I was wondering if all my texts are charged because I have checked my data usage and it showed overage but I'm on unli text.

Data MB:6.52
Messaging: 160 of Unlimited
TXT/I'm to International Overage: 171

What is that overage and am I going to pay those?

Depending on your carrier and plan, some carriers will charge you for text to Canada. Without you telling us what provider you are on, for sure you're not with Sprint or T-Mobile. I believe AT&T charges for texts to Canada, so does Verizon. 25 cents to send, 20 cents to receive to/from Canada.

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