The reader itself if not tied to any particular phone. All it does is communicate with the app which in turn links to you PayPal Account. What you need to do is ensure that you have a PayPal Business Account. You can then setup the Multi-User access feature which allows more than one person to access a single PayPal Account. If you alreay have this setup, great, if not, you can learn more from this user guide: https://www.paypalobjects.com/webstatic/en_US/developer/docs/pdf/pp_merchantsetupadministrationguide.pdf
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