[Skunkworks] unlocked modems and the support for 3g networks

hi folks i have a safaricom modem that is unlocked and every time i connect an orange modem it disconnects after 2 minutes... is this common when a modem is unocked and does one enjoy the 3g speeds on a unlocked modem but using orange 3g lines? Guess what im asking is whether the 3g network speeds is dependednt on the modem or the subscriber network...... i have an e220 modem...will it pick 3g speeds of an orange line? regards. -- WALLACE NGENE TARURU wallacengene@gmail.com