Hardware

This page lists various modules which could be used in a Homebrew Mobile Phone. NOTE: Some of these items may be hard to source in small quantities. See Suppliers for a list of goodies you can get hold of.

Application Processor Module

Typically, The application processor, the heart of the phone is housed in it's own module along with some flash memory and some RAM. The choice of application processor is critical for a homebrew design as it dictates not just the processing power of the device, but also of the additional peripherals you can attach to it such as wifi modules & audio codecs. Companies who make add-on modules for their Application Processor Modules (i.e. Gumstix) are ideal as they have done a lot of the hard (& expensive) work of designing PCBs etc.

Intel/Marvell PXA255

The almost famous Intel XScale processor, found in many devices. The Entire XScale line was sold to Marvell in 2006, who support the PXA255.

Gumstix

The original Gumstix computers are based on the PXA255

Cellular Wireless Modules

There are a _lot_ of different standards for cellular networks out there. They generally fall under 4 different "Generation". Wikipedia has some useful information about this: GSM Use the selector on the right-hand-side to view information about a particular generation.

Generally, each generation has a different set of frequency bands which they use, however these bands are not universal across the world with some conuntries usings one band and a different country using another. E.g. While a GSM/GPRS phone is always a GSM/GPRS phone, there are 4 different bands which are used across the world.

2.5G (GSM & GPRS)

These days 2.5-generation modules are the entry point. They have GSM for voice & SMS and GPRS for data. There are different classes of device which dictate how the GSM & GPRS functionality inter-operate. For more information, try Wikipedia's GPRS classes.

Telit GE863

A Class 10, Quad-band GSM/GPRS Module. Also features an integrated GPS module. Availability: Main_Page#GSM_Modules

Telit GM862

Quad-band GSM/GPRS Module. Also avaliable with a Python interpreter! Availability: Main_Page#GSM_Modules

Telit GM862-GPS

Same as GM862 but with an integrated GPS module. Availability: Main_Page#GSM_Modules

2.75G (EDGE)

2.75G adds higher speeds to GPRS using a technology called EDGE.

Siemens MC75

Class 10, Quad-Band GSM/GPRS/EDGE module. Interfaces using USB2.0. Availability: Soon (Hopefully) :-)

3G (UMTS)

3G is, that's right... a bit faster still than EDGE. It was developed before edge, when phones were running at 2.5G. They run in a different part of the spectrum to 2.x G, which cellular operators paid a _fortune_ for a few years ago.

3.5G (HSDPA)

3.5G upgrades the UMTS bitrates using a technology called HSDPA. Because of the higher bandwidths used, these modules are usually interfaces using USB 2.0. As a result, integrating them into a homebrew phone is going to require a Linux driver to be sourced or, more likely, written. It's probably best to stick to the lower speed devices - for now.

Sierra Wireless MC8775V

Availability: No Supplier Found

Siemens HC25

Availability: No Supplier Found

WiFi Modules

WifiStix

Audio Codecs

UCB????

LCD Modules

As with many types of components, there are lots of LCD modules avaliable. Here's a short list of ones identified by members as possibilities for various phone projects:

LCD modules

Make & Model	Resolution	Size	Suppliers	Notes
Sharp LS037V7DW01	480x640	3.7"	Listed on product page	???
Sharp LS037V7DD05	480x640	3.7"	???	Used in Axim 50v
Sharp LQ043T3DX02	480x272	4.3"	Listed on product page	Used in PSP
Sharp LQ050Q5DR01	320x240	5"	Digikey	Instructions on connecting to gumstix here
Panasonic EDMGRB8KJF	640x480	7.8"	EarthLCD	Instructions on connecting to gumstix here