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If you receive a "Device Limit Reached" error while adding your Purdue Mobile ID, your credential is already assigned to the maximum number of devices allowed. Purdue Mobile ID can be active on one phone and one watch at a time. This issue most commonly occurs when you replace or upgrade your phone and the Mobile ID remains associated with your previous device. To add your Purdue Mobile ID to a new device, it must first be removed from the old device.

Purdue University is mobile-first for students. This means the Purdue Mobile ID is the primary and official form of student identification. Students use their Mobile ID to access campus services, facilities, and resources using a compatible smartphone or smartwatch. Physical ID cards are generally issued only when a student does not have a compatible mobile device or qualifies for an approved exception.

NFC is the technology that enables Purdue Mobile ID to communicate with readers, while Express Mode is a feature that removes extra steps, allowing faster and more seamless access on iPhone.

Purdue Mobile ID is Purdue University's implementation of Transact Mobile Credentials. Transact Mobile Credentials is technology that enables authorized users the ability to download the Transact eAccount app, add their Purdue Mobile ID to either Apple Wallet or Google Wallet, and use their iPhone, Apple Watch, or Android smartphone to access campus buildings, purchase meals, and more, the same as they would their physical Purdue ID Card.