Here are the tricks of the trade I've found:
1) Take time to pick your location carefully. If you're going to a developed campsite, don't show up on Friday or Saturday. Your options will be limited. Understand that reception make suck at the site at ground level, but just by hoisting a cell phone 10 feet, you'll get good reception. Have a bluetooth ear piece to help facilitate this.
2) Pick your laptops *carefully*. I use an Asus T100 for backpacking because has a long battery life and it charges off of standard USB and is relatively lightweight. When developed camping, I use an Asus UX-305.
3) Solar backpacking equipment is more or less useless, as is the reactor hydrogen fuel cell. The solar cells are too small to produce a meaningful voltage. Your best bet is to bring charged batteries.