Unable to send or receive MMS

[rsmcomputer]

My BYOD OnePlus 5T has NEVER been able to send or receive SMS with pictures, no matter how small (can't even send a 50kb JPG).  When I try to send a text with a picture, 5-10 seconds after I click send ( >>) I get "Message not sent: service not activated on network"

I've revised/added/deleted APN settings over and over based on the latest blog suggestions, confirmed that MMS will not work when I am connected to my Wifi or not, tried three or four different texting apps (Messages (default - blue icon) Messages (green icon, Textra, WhatsApp), on my 3rd Cricket-issued SIM, had Cricket retail technicians try to fix, etc.  I am ready to switch to another provider.  PLEASE, someone, HELP!

[BillyM_Cricket · Accepted solution]

Hello @rsmcomputer

You may need to check your message center number. The number for the SMSC address should be +13123149810.

Thanks!

[rsmcomputer]

That is the number that is configured in my phone.  Thank you for your suggesting that I check this.

[Laurabrito]

Help I've been unable to receive or send picture messages

[Accmpc349]

I already have this number in my message center. I still have to turn off WiFi to send or receive mms. When will this be fixed?

[Brentlim]

Where is this found, how do I check it?