“Hillwalkers and climbers who go to remote places with bad mobile phone reception have been advised to register for a service that allows 999 calls to be made by text.” source: http://news.stv.tv/scotland/210134-hillwalkers-urged-to-register-for-text-999-service/.
I think setting up for your mobile, if doing the End2End cycle would be a great idea 2. I know in the Highlands section of the cycle, even on the A and B class roads, the mobile network is not at it’s best.
To register, text “register” to 999. You will get a reply; then follow the instructions you are sent. This will only take approx two minutes of your time and could save your life.