I want to be able to login as one of my users to check to make sure sms campaigns fired or their permissions are correct.
Hey Doug 
We already have this feature available on our Enterprise plan. If you are on any other plan, this feature would not be accessible and you will need to login to the respective user’s account using their credentials.
If you would like to consider and discuss upgrading to Enterprise plan, feel free to reach us over chat and we’ll be happy to assist you.