Hi everybody

I've been searching around, without too much success, for a hiker's solution to boosting cellphone signal.

Most of the results I see are car based amplifiers/booster and antennae, but nothing decent and portable enough for a backpack.

Do you have any suggestion / further reading on the subject?

I know there are radio solutions, etc. but I would really appreciate if anybody has used something that works well with cellphones,

Thanks,