The first thing to try is a simple battery pull. While the device is on, remove the battery for 15-30 seconds, reinsert and wait for the device to reboot.
Does that help? If not, the next step would be to contact Rogers and have them check things from their end. It's possible that there may just be a network issue. Also, is this a problem to multiple numbers or just one phone number? In some cases, there can be some compatibility issues between networks, so that could explain it. But Rogers would also be your best bet to see if that's the case.
If you're unable to resolve the issue with the battery pull or by calling Rogers, let us know as there may be some other things we can try.
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