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When boarding passes are delivered to your phone, it is usually done as either a text message or email with an image of your boarding pass or barcode on it. Whenever I have done this there is an option to send each boarding pass to a different email or phone number. So all you would need to do is collect an email or phone number for each person and get the pass sent to them. Alternatively if you get all the passes sent to you you can forward the message to the right person.
There are almost always alternatives to having the boarding pass on a phone. Generally there is an option to print them yourself if you check in online. You could then hand out the paper ones to your group. And finally there is the option to check in at the airport and have counter staff hand out passes. This can be done even if you have already checked in online.