Phone service ?
I live in a motor home. I am putting a metal RV cover over it. This will interfere with my phone service. What can I get to help with getting cell service.
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If you have broadband internet service and a reasonably new smartphone you can use what's called "Wifi Calling" which totally solves cell signal strength problems. Contact your cell service provider and ask if they (and your model phone) support "Wifi Calling"
If you have WIFI connect to it. My daughter does that when she visits me. Saves on her data usage also. If no WIFI you can get a signal booster but they are expensive.
https://www.ubersignal.com/blog/how-to-boost-cell-phone-signal-in-your-rv/
https://www.amazon.com/weBoost-470201-Booster-Towable-Motorhome/dp/B01721E6HW
https://www.google.com/search?q=rv+cell+phone+signal+booster&source=univ&tbm=shop&tbo=u&sa=X&ved=0ahUKEwiI6-Sl_vncAhUMXa0KHZbiCSgQsxgIJg