Yup! I get that when I'm near niagra right at the border.
If you are potentially closer to a US antenna at a time, you can roam to it.
If you are near a border City your phone will Roam to the network that has the strongest signal at that time and location. To avoid this you can go into your phone settings and turn off your Roaming feature to Manual instead of Automatic. This way your network will only change if you request it to do so.
Not sure of its actual distance, but Rochester New York is right across the lake, although it's probably further than Niagara as the crow flies.
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