Great question — answering as the UphillTech team:
In the U.S., the phone/cell companies offer a feature referred to as "Call Forwarding". When you leave one location, you set the phone there to forward any incoming calls to your number at the other location. And visa-versa. You would need to consider the possible costs of long-distance charges, however, the potential earnings from sales of those not-missed calls might be sufficient to offset the expense. Another option would be providing one business number, a cell phone (seperate from your personal cell phone). As long as you were able to get a reliable connection in both areas and there weren't any "roaming" or otherwise excessive fees involved. That would eliminate even the annoyance of...
Full answer by elbrant: https://webmasters.stackexchange.com/a/121791 (CC BY-SA 4.0).
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