Tia Valeria, a very experienced and valuable contributor summarised this thread admirably:
Others feel the need for more gear and that is their choice, especially if it gives them, or their families, greater peace of mind.
I would like to comment as a slightly technological challenged mid-seventy person that the past six years since my last Camino the cost of cheap Android smartphone and the dumb phone recommended with a PAYG card has narrowed to a point any one replacing the dumb phone would get a smartphone.
AS you travel to the start point of your Camino in Spain you will see, for better or worse, hardly anyone using a dumb phone and these will become a rarity in the years to come. The smartphone has advanced to eliminate the need to carry more gear, it has excellent photo and video capability and replaced my a point and shoot camera, it replaces a torch as apps will make the phone into a torch or flashing warning light, the display screen is bright enough to see in the darkened room and toilet, it provides radio and music which replaces the music/radio player, it can provide and store reading material and information such a maps to replace written material, and much more. Alarm clock, dictionary, address book, diary, GPS, blog, sketch pad; it can now electronically arrange your flight details and provide a digital boarding pass, just to name a few.
Smartphones communicate freely when you have Wifi (in connected Spain you will not be short of free fast Wifi) with Apps like Skype. Viber, Tango, plus myriad other free cross platform communication Apps. Facetime as mentioned on other threads is also used but locked between Apple to Apple devices, it cannot communicate with the increasing amount of commonly used Android, BB and Windows phones. Communication is now at another level, you have video talk, you can edit and send pictures and videos immediately they are taken with its location imbedded, texting is straightforward with its predictive and voice and screen writing capabilities. Serious writing can be done by wirelessly connecting the smartphone by Bluetooth to a portable pocket-sized 130gm keyboard which fold out to a full three quarters size keyboard. With a miniature sized mouse if one is inclined to use a 60gm gadget and not the fully functional touchpad.
If you are using a smartphone (who doesn't if you look around the streets in Spain) there is no point to leave it behind and purchase a dumb phone which you will find little use when you go home.
To each his or her own, this interesting debate on gadgets will be entirely different in another six years judging by the gadgets now used on the Camino. In conclusion you have the choice to use or switch off the phone if you carry one. It was comforting for my family to be able to contact an old man walking alone in a foreign country halfway round the world away. And vice-versa.
Joe