Using Gen4 bandwidth before upgrading to Gen5?

Yep yep, like BirdDog stated, tomorrow when your Gen5 unit goes online, you should get the full 50GB on your new plan, so use as much of the 20GB as you can now.

With that said, be aware, with you being an upgrade from Gen4 to Gen5, the system usually will not give you the daily reset for 20 days that new customers would get.  You will start out at 50GB, and keep going down as the month goes on instead of being topped up the first few weeks.