Connecting or creating an Asana account via mobile number.

I would like the ability to connect to my team via mobile numbers. I manage a machine shop and use Asana to track jobs. My team doesn’t work from a computer, therefore emails don’t work well and I can’t assign them jobs and send notifications. If they could make accounts that link to their phone number to use the app and sent a text message alert, I could reduce the amount of time I spend having to show them what to work on next. Not to mention, I could attach blueprints to the tasks which would save time, and give them more access to crucial information.