Is roaming charge possible to happen in area even not near US border?

I live in Ottawa, but travel frequently along Hwy 7 (to Peterborough) and the 416/401 to Picton, so I have experience with roaming outside of Videotron's network.

There are no charges for roaming on Rogers or Bell's networks in these areas. 

I have had times where my phone would have "No Service"... I think it's because the phone doesn't have up-to-date information about the networks. Usually a reboot will download new service data, and solve the problem.

Another problem when roaming on Rogers or Bell may be that you have phone service but no internet. To solve this, you will sometimes need to go into your cellular settings and disable automatic network selection, to choose a specific network instead. Just remember to re-enable automatic selection when you're back home.