@stefcep2,
I like your thinking!
I have a 7 year old Nokia 1100, which is as simple as you can get - and small.
It was in the drawer with an expired SIM card for three months. Just got a new SIM, but will probably never use it. :-)
I only have the mobile so that when I'm out fishing (and if I ever need to make an emergency call, or get a call from home) then I have it...
I actually use the alarm-clock function more than anything else...
As for the future, I think I'll keep this one for another 7 years!
Mike.