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Go to the Activate your AT&T wireless device page.Follow the steps below to activate your device in no time. Activating an AT&T Wireless Device OnlineĪT&T makes activating a wireless device online easy. With this app, joining the AT&T Wireless network becomes easier. The AT&T Mobile Transfer app helps you to move your information to a new device. AT&T provides device support to help you through this process. To activate an eSIM card, go here.įor new devices, AT&T Wireless uses a simple activation process that requires you to follow the on-screen instructions.įor unlocked devices you already own, you need to insert your new SIM into your device and follow a similar activation process. AT&T Wireless works with both SIM cards and eSIM cards and allows you to use up to two SIMs with different numbers per device.ĮSIM cards are the electronic equivalent of a traditional SIM card. You can activate AT&T Wireless on a new phone or tablet as well as on any unlocked mobile device you already own. Activating AT&T Wireless Device Ways to Activate AT&T Mobile Devices