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2. List of open-source mobile phones - Wikipedia

   en.wikipedia.org/wiki/List_of_open-source_mobile...

   Generally, the phones included on this list contain copyleft software other than the Linux kernel, and minimal closed-source component drivers (see section above). Android-based devices do not appear on this list because of the heavy use of proprietary components, particularly drivers and applications. [7] [1] [8]

3. USB communications device class - Wikipedia

   en.wikipedia.org/wiki/USB_communications_device...

   USB communications device class (or USB CDC) is a composite Universal Serial Bus device class. The communications device class is used for computer networking devices akin to a network card , providing an interface for transmitting Ethernet or ATM frames onto some physical media.

4. USB On-The-Go - Wikipedia

   en.wikipedia.org/wiki/USB_On-The-Go

   USB On-The-Go (USB OTG or just OTG) is a specification first used in late 2001 that allows USB devices, such as tablets or smartphones, to also act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mouse or keyboards, to be attached to them. Use of USB OTG allows devices to switch back and forth between the roles ...

5. USB communications - Wikipedia

   en.wikipedia.org/wiki/USB_communications

   The written USB 3.0 specification was released by Intel and its partners in August 2008. The first USB 3.0 controller chips were sampled by NEC in May 2009, [4] and the first products using the USB 3.0 specification arrived in January 2010. [5] USB 3.0 connectors are generally backward compatible, but include new wiring and full-duplex operation.

6. USB - Wikipedia

   en.wikipedia.org/wiki/USB

   On devices that do not use PD, USB provides up to 4.5 W through Type-A and Type-B connectors, and up to 15 W through USB-C. All pre-PD USB power is provided at 5 V. For a host providing power to devices, USB has a concept of the unit load. Any device may draw power of one unit, and devices may request more power in these discrete steps.

7. Comparison of open-source mobile phones - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_open-source...

   I2C pogo pins, back mods can be added (all compatible with original PinePhone). USB 3.0. Bootable from a microSD card. Good parts availability. [6] [1] GPS and modem on same kill switch; neither can be used while the other is airgapped. [1] entire phone can be disassembled. Headphone jack.