You'll probably need to explain in more detail exactly what you did and what happened.
What exactly do you mean by "browser installation failed"?
You mean that you couldn't download/install some browser from your phone's app store or something?
Configuration of the APN settings doesn't involve the (web) browser.
To configure your APN settings correctly see here:
If you're on Android you can text "APN" to 50048 and follow the instructions here to do this:
Once your APN settings are configured correctly and you have an active membership with a mobile data allowance then all connected apps and web browsers should be able to connect.
If only some apps/browsers can connect but others can't then there may be some issue with your phone settings.
E.g. some apps have permission to use mobile data connectivity but others don't.
If you need to contact 48 support about this then see the links in my signature below.
