How does MMS work after switching the SIM card and carrier?

[New Daddy]

Originally Posted by demonlordoftheround

Wirelessly posted (Mozilla/5.0 (Linux; U; Android 2.3.6; en-us; SPH-D710 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1)

Verizon likely uses their servers to send mms, but when you are using the sim card, those settings are not in use.

There is no doubt about it. What I'm trying to achieve is to send and receive MMS through the third-party foreign carrier, not Verizon Wireless.

My question is, how do you override (or disable) the Verizon Wireless MMS settings so that I can use the third-party foreign carrier's MMS settings instead. I had to change settings for voice and data, so I'm assuming I'd have to change settings for MMS as well. I just can't find where.