MMS to read with code online

Hello,

I receive messages on my iPhone like this:

(Info Bouygues Telecom: read your new MMS from 06xxxxxx, with the code 0pevqc at www.bouyguestelecom.fr, section ASSISTANCE > MMS Reading)

I know the person who owns this number, so I assume it's not a premium number trap or a scam.
How can I receive MMS directly?
(I am with B@you, not Bouygues Telecom anymore).

Thank you for your help

Configuration: Mac Pro 4,1. G5 2X 2.26 GHz Quad core Intel Xeon Memory 6 Go. Mountain Lion OS 10.8.2 with Windows 7 pro
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Iphone 5
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Best regards.
Pierre