Operator logo, all about...

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The operator logo is the picture on the upright corner of your phone's idle screen, and appears instead active network info in text format, in most cases it is a stylized name/logo of your operator.

OP logo is a Bitmap file whose size is 97 x 25 pixels, stored at the following path: C:\System\Apps\Phone\OpLogo\

Their names follow some important rules according to the format below:
xxx_yy_ww.bmp

Code	Descripton	Sample
XXX	Mobile Country code	219
YY	Mobile Network code	1
WW	Mobile Subnet code	0

Mobile Country Code (MCC)
and Mobile Network Code (MNC)

The operator must have a assigned Mobile Country Code (MCC) and a Mobile Network Code (MNC), since these codes are part of the IMSI number, that's used as the main subscriber key in GSM location databases.

The MCC is the first field of the IMSI and it's three digits in length; it identifies the country. The MNC is the second field of the IMSI and it's two or three digits in length; it identifies the network within the country. The MNC, in combination with the MCC, uniquely identifies the home network of the mobile terminal or mobile user.

The allocation of MCCs is administered by ITU-T, International Telecommunication Union.

Figure 1: IMSI Structure

ITU-T publishes the list of Mobile Country Codes in its form, Complement to Recommendation E.212, "List of Mobile Country or Geographical Area Codes." This form is available at ITU web site.

MNCs are administered by the designated administrator within each country (usually the national telecommunication authority of regulation). The operator can recommend the MNC but in all cases, the country regulator will have to approve it.

For example:

Croatia
T-mobile (219 01) => 219_1_0.bmp

Spain
Vodafone (214 01) => 214_1_0.bmp

If you have doubts about your network code, you could find the list of country codes at[this] link and network codes at [this] link, and keep in mind that you have to ignore the leading "0" in the network code, if it exists.

Guru tip No 1:

Also, don't forget you can store as many Operator logos as you want, for example if you travel very often and roaming is common for you, or you have several SIM cards from different operators, you can simply make logos for every single network and they would change automatically with the network you’re currently subscribed to.