My bb app world is not authenticating and it says "try again later". what should i do?!?!?

-try hard re-boot, remove battery with phone on, wait a few seconds then replace. also make sure with your service provider that your blackberry data plan is activated.try hard re-boot, remove battery with phone on, wait a few seconds then replace. also make sure with your service provider that your blackberry data plan is activated.restart the phone