I have system admin access in our org. Can I login as another user in the Salesforce1 mobile app? - Answers - Salesforce Trailblazer Community
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Natalie MancoskyNatalie Mancosky 

I have system admin access in our org. Can I login as another user in the Salesforce1 mobile app?

Pritam ShekhawatPritam Shekhawat
No, unfortunately you can't login. You can promote and upvote this idea here Salesforce1 Admin login as another user (https://success.salesforce.com/ideaView?id=08730000000l6Y6AAI). 
Ankush DurejaAnkush Dureja
++ Pritam, we can not login in Salesforce1 app by login as another user.

But if you want to test Salesforce1 app by login as another user, you can login as another user in Salesforce browser in your System. Then you can use following way to test your app:
https://help.salesforce.com/articleView?id=000204818&type=1

Hope it will help.