Do I need to have a sling connected to dvr for the 24hr test drive

No...

The Test Drive is for people who have never had DISH to see what TV Everywhere is really like. It lets you remote control a special DISH Network receiver and watch it on your mobile device for 24 hours.
 

DISH Price Increase

EPG Issues (Guide jumping from 2/1/12 to 11/29?)

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