In the text payload, a section called UDH (User Data Header) is optional but defines lot of advanced features not all mobiles are compatible with.

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It will support 4G LTE data and voice through an optional chipset.

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An optional global positioning system unit encodes geographical meta data into your photos.

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The optional, extra-cost, 4G LTE cellular-data capability made it feel like I was always on a fast Wi-Fi connection.

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Examples include the FSM-SENS-1, a 6-axis sensor-only module that integrates with an external Freespace MotionEngine, and the FSM-SI-2, which combines the Freespace MotionEngine on an embedded microprocessor along with a 3-axis digital gyroscope, 3-axis digital accelerometer and optional 3-axis magnetometer (compass) to provide high-performance, calibrated motion data for a variety of applications.

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