The only way you can use handsets that were for Net10 or TracFone
> outside of their systems is if you have them reflashed with generic
> non-Net10 or TracFone specific firmware.
> Why would that be a problem? Is there some reason that makes these
> phones particularly difficult to reflash? Reflashing is trivial on > most other phones.
You said it yourself. Reflashing is trivial on most *other* phones. From what I understand reflashing Motorola is fairly easy. It's not so for Nokia unless you have invested in the specialized equipment, dongles, clips etc. to do it. Considering the value of the typical phones used for TracFone or Net10 it's a lot of work for little profit.