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The S7 is a huge problem when using unlocked on another provider. Carriers have say in what happens in the OS, and a lot will put little funky things that "lock" some features to them even though the phone can be unlocked. MMS is usually a problem with the S7s.
There's been some threads where folks said they got things to work. Here's a good thread about the Verizon S7: Problem switching from Verizon to T-mobile. S7 Edge Resolution APN Settings.
Having the same issue here No MMS after switching Verizon Galaxy Note 5 to T-Mobile. After reading this thread what is the answer to this issue
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Hey there! Sorry to read you're having trouble getting your S7 to cooperate with the network! Were you able to find any helpful steps in the thread that Smply linked above? When it comes to non-TMO devices; we're able to offer support with our Bring your own device setup guide but ultimately, we're not able to guarantee full network compatibility -- our Non-T-Mobile phone & software disclaimer explains that in a bit more depth. We do want you to be able to get this working rather than see you go, though! IIRC, one recommendation that seems to be pretty popular in the threads we have about these issues is to ensure that you're deleting the existing APN profile before adding the new settings in. I can dig for more threads for you if you're still looking for help -- please let us know!
I've experienced the same thing, but you can give this settings a try, please note to copy the correct MMSC and the APN type.
Proxy: Not set
Port: Not set
Username: Not set
Password: Not set
Server: Not set
Multimedia message proxy: Not set
Multimedia message port: Not set
Authentication type: Not set
APN type: default,supl,mms
APN protocol: IPv6
APN roaming protocol: IPv4
Turn APN on/off: APN turned on (this is grayed out)
Mobile virtual network operator type: None
Mobile virtual network operator value: Not set (this is grayed out)
then on network mode , please make sure it is set to LTE/GSM/UMTS