[android-developers] Question about APN for Browser and MMS

I'm very confusing about APN in android.
I saw the apn type on APN setting could be 'default' for data
connection and 'mms' for MMS.
(Are there else values??)
If the apn type value should be one of them, does it mean that it
separated by only for MMS and for the other apps?
Anyway, I heard that a single APN used for AT&T with some exceptions
for blackberry and so on.
If AT&T supports only one APN for all applications, then what is the
apn type value??
Could it be blank?
Let's assume there is a carrier support 2 APNs for 'MMS' and 'Another'
applications. and there is a default APN for MMS already on my phone.
If I add a new APN for 'Another' app with apn type 'default' and set
it active profile from the APN list, then I cannot use MMS. right?
Should I have to change to default APN to use MMS?
Or Can I use MMS even if the profile for MMS APN is not active?

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