MMS not working on iPhone

Super pleased so far with many ease of use, feature and especially the online service/help. My service took about 2 hours to port and seemed relatively quick. Data is up and running after updating carrier services. How do I setup mms services? I can't use iMessages with my assigned cell number. "Activation Unsuccessful" I cannot manually change my network parameter (APN) settings and my IOS is updated. Thanks everyone in advance

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