Not a problem with telenav
harper828,
I am an ex-cab driver so I know where everything is in Knoxville but still I'm with AT&T too but have been testing out the AT&T's Telenav and have had no problem with it. When your using your Nav4 GPS how long are you using it, Long trips ? out of state ? GPS is good for short travel times but if your going out of state Its best to have a car charger and also remember the harder your phone fights to get a signal the faster your battery gets drained.
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