Thickness of device is measured at the edge of device.  Thickness may be different at different parts of device.
All units of measurement may vary slightly according to manufacturing tolerance.

Platform may be different after software update.

MicroSD card and SIM card cannot be placed in MicroSD card tray at the same time.

Available storage is less due to phone software. Available storage is subject to change based on phone software updates and apps usage.
Extended memory limited to available microSD card size.

Network bands in regions may be different, depending on the mobile operator and your location. 4G LTE only available in select countries. Upload and download speeds also depend on the mobile operator.

Test conditions: The battery claims herein may vary based on cellular network, location, signal strength, feature configurations, phone usage, and many other factors. Actual results may vary. All batteries have limited recharge cycles and eventually need to be replaced. Battery life and charge cycles vary by use and settings. Battery tests are conducted in HTC laboratories using specific HTC devices. All test devices are connected to a 4G network except for Wi-Fi-based tests. HD video playback is conducted with 720P HD MP4 video on a device with audio through a headset, with default screen brightness and audio level (without Dolby). Audio playback is conducted with an MP3 audio file with audio output through a headset with default audio level (without Dolby). Internet use over Wi-Fi tests are conducted using a dedicated web server. Device browsed snapshot versions of 10 popular web pages. All settings are set to default except Auto-Brightness is turned off.
A Standby time specification  (""specification"")  is an industry standard that is only intended to allow comparison of different mobile devices under the same circumstances.  Power consumption in a standby state is strongly dependent on factors including but not limited to network, settings, location, movement, signal strength and cell traffic.  Comparisons of different mobile devices using such a specification can therefore only be done in a controlled laboratory environment.  When using any mobile device in real life circumstances for which the mobile device is intended, the standby time could be considerably lower and will be strongly dependent on the factors as mentioned above.