It is possible, however you will need quite a few of them just for any type of newer phone.
Best would be to link up enough to make twice to voltage needed.
BEST Google joule-thief and follow those instructions.
Laptops are a big jump, but if you have enough of them, go for it, BUT it will take a very very long time to charge, since they are probably only put out about 1.5Vdc and around 0.02ma.
Best of Luck