Depends on the brand and model of the GPS,
and the brand and model of the smartphone.
It is a 10 inch cord that attaches to the base of the phone charger.
Chances are, there is either a problem with your charger cord, or with the charger in the phone. Try buying a new cord first (they're fairly cheap), and if that doesn't help, you may need to take the phone in for repair.
to charge
The charger itself should be compatible - the cord will not be.
It did For me
Yes.
Yes, you can put the iPod Touch wall charger into an extension cord. That extension cord has to be plugged into a wall to be able to charge the iPod, though.
it depends on which type like Sony , Samsung you can charge it with a USB cord
Nokia chargers charge sidekicks because if the end of the charger cord fits into the charger port of said device, most chargers (can be wall or car) will charge any device with an ac battery or dc-ac adaptor, and if your Nokia doesn't charge, four possible reasons are a. the electrical outlet doesn't work right. b. you have got the wrong charger, c. a short somewhere in the charger or device, or d. the charger cord doesn't fit right or the end of the cord has been put into the charge port wrong. Well, I hope at least one of these answered your question.
yes
use an USB cord
USB chargers are not universal for all phones. Some phones will not charge using a USB cord and some will. It depends on the brand of phone. Some Motorola phones need a specific charger or they will not charge.