Requirements for Mobile Phones (English)

I would like to propose the unique requirements for mobile phones. The following items are significant considerations under mobile site development, especially in i-mode phones.

1. UserAgent type that is, a Browser Name of CGI environments which is sent by a mobile phone to a web server.
2. Range of IP addresses in each mobile operator, which is required to judge whether a user is using a mobile phone or a PC in order to support both of them in the web site. In Japanese mobile phone operators, they are using their specific proxy servers, which are accompanying with the specific range of IP addresses.
3. Screen Size of each mobile phone, especially the size of width, which would be found in a CGI environment UserAgent in the latest phones
4. Image Format such as JPEG, PNG and GIF supported by each mobile phone
5. Maximum Size of Receiving Bytes per a page
6. Difference of Handling Colors in each mobile phone
7. Difference of Smilies (Picture Icons) both in each mobile phone and operator
8. Name Convention of an E-mail Address in each operator (Japanese i-mode e-mail system violates RFC).
9. Available Character Set in each operator (Shift-JIS, UTF-8 in Japan)
10. Available Character Types in each operator (such as ZENKAKU, HANKAKU in Japan)
11. Available Input Method in each operator (Access-key concept in CHTML)
12. Support of Native Functions of a mobile phone (i.e. switching a browser screen to an e-mail application with 'mailto:' in CHTML at a single screen of a mobile phone, launching Java application, and directly calling to someone with 'tel:' in CHTML, etc)
13. Difference in between Official Sites and Unofficial Sites (The acquiring information is different)
14. Session Management because we cannot use cookie in i-mode phones