I recently bought the LG marquee thru BOOST, after changing my dun/nai settings to be able to tether, i have lost signal and been told i need to activate my phone. i tried to restart the phone... didnt help, i had to pull the battery several times and it finally came back around. i did notice that when phone is not operating properly my dun/nai settings that i would change to "no" to be able to tether after a restart is already set to "no" and my ppp network is saying "undetermined", instead of "sprint"???? What is causing this and what do i need to do to correct or keep this from happening again.