FAIL!
I dont know if its the app or just the USPS themselves that seem to be useless. I have all the major shipping company apps and they are all current, up to date tracking with ETAs and current location. I have even received a package and 3 days later it still says its at a facility somewhere in the states. Dont think this app is of much use!
BUCKT0WN about
USPS Mobile®, v3.2