A logo has two parts. One is the picture itself and two is a network identifier. Remember, the name is OPERATOR logo, so a logo is displayed instead of a certain OPERATOR name. In other words, a logo belongs to a network. Every network has its own unique code and that code is embedded in the logo. A logo will only be displayed if the embedded network code is the same as the network you are logged on to.
For example, you have received a logo for network 123. Your phone has logged on to network 123. The logo is displayed. As soon as you travel to another country and you log on to another network the normal network name is displayed. The logo is not erased, it's just not being displayed while you are there.
The most frequently asked questions
I received a logo, I saved it, but now it's not displayed
You received a logo with another network code than the network you are currently logged on to
There's that place on the web where I can send logo's to my phone. However, it does not ask me for a network code and I don't see the logo so it must be a wrong code.
This happens sometimes. A website not asking for a code does not mean that there's no network code embedded in the logo. The website will try to determine the correct code based on your phonenumber, because they feel asking the code is to difficult for their users. The drawback is that the website will guess wrong every now and then causing you to receive a logo that you will not be able to see.
I have a logo that I want to delete. How?
There's no 'delete' option in the phone. You will have to send a logo to your phone with a fake network code, from a network you will probably never log on to.