Hi there @Vivian Xu 

Sometimes the device is going to catch the network on the other side.

It's a world-wide situation, since the device settings are set to automatically search for the strongest signal.

You can change that in the settings of the device and set it to Manual Network Selection, after it's done searching, you select Koodo and it stays connected to Koodo, even near the border.

I would also advise to keep Data Roaming off while in Canada. This will avoid any accidental charges. We have a great help page here: https://community.koodomobile.com/plans-services-232910/easy-roam-understanding-how-you-will-be-charged-while-traveling-7811296

The message received can be informational only. We don’t see any charges yet. When the invoice is released and if you see any fees, you can create a new post and we would gladly look into it.