I can only speak for my own telco, Vodafone NL. It seems they have different APNs because there are different connections configured (there are 4, in fact). But that is not the case. They have the same APN name which you can see in details: live.vodafone.com with username vodafone and password vodafone. The only difference is the default homepage. For MMS, it is http://mmsc.mms.vodafone.nl so at least in my case there is no need for a seperate ppp1 please verify in your phone settings about your case. YMMV.