Just done an excellent Outdoor First Aid Course with Paul Lewis (PeakMountaineering) and we were talking about useful apps for phone. I have spoken to some in the club about them and not everyone knows them so here goes....
Free app from Ordinance survey that gives your current OS grid reference and also acts as compass. Does not need phone signal. This will locate you to 100m if you need to tell emergency services where you are
What Three Words
Free app that divides the world into 3m squares and identifies each in terms of three words. Emergency services familiar with this, so you can give your location in this way. I am currently at then.signs.credible if you want to find me!
Both the above have facility to share location via text, Whatsapp etc.
The 999 service runs a text system designed for deaf/hard of hearing. However, also useful if you are in very weak signal area where voice calling is not possible but you can just squeeze a text out. You need to pre-register your phone for this.Do this by sending REGISTER to 999. This generates an automated reply with the terms and conditions to which you need to respond YES to complete the registration process. If you then send a text with details of injury, location etc, then you will know this has been received when they reply by text.
Worth 10 minutes to load these I reckon...