OK here it is,
AT&T or Verizon only
Keep ur phone warm I use a hot pack in a sock then put both into a second sock. By keeping your phone warm your antenna will work much better, also it will make your battery last much longer.
Cell sites are designed to cover most roads and highways or places of high human traffic. These sites paint highway cooridors/ valleys.
Get to the top to call.
A text is a one way message and will not require the same transmit/receive sigals that a call will. If your deep a text is ur best bet by far.
Put your phone in either GSM/umts or in Cdma/LTE under mobile network settings.
Check your bands your phone uses on Google. Make sure there is a low ban 700mhz-850mhz on voice. Also make you have a 2100-2300 mhz band. This allows you to grab a high frequency signal from a mountain top a small distance outside the cooridors.
Rf bounces- use lakes / bluff above Meadows and lakes sometimes helps.
Know where your closest tower is to the areas you ride, the stores can help with that. Map ur mountain top Line of sight or close too for the areas you ride.
They are not gonna build us a tower. I build pletty of ATT and Verizon New site builds and RF engineers are more concerned with capacity issues in high density areas like stauims traffic jams, and in building networks called das.
My advice is to make your calls proir to the snopark. Give the phone numbers of your people at home to each other's people at home along with where ur planning on ripping that day. Connect the people not riding.
P.S.
I build a lot mountain top sites and we all use radios!