You can spoof the wireless signal if you don't get coverage. There are surely more and better Android options, but I used Clock Wave to set a clock from Germany

You can spoof the wireless signal if you don't get coverage. There are surely more and better Android options, but I used Clock Wave to set a clock from Germany back in the US. https://cw.rzapps.com/ https://cw.rzapps.com/ It's really clever! It uses the speaker as the low frequency transmitter. It doesn't sound right, but it only needs the coil to radiate EM waves.