Just recently I've noticed that when someone sends me a photo by way of text message, it's not coming thru. I tried sending a photo to someone by text message and they never received it. I've gone thru the settings to try and find some solution but couldn't find anything about text messages.
Make sure you have MMS enabled for text messaging and make sure your cell carrier account has MMS enabled on your text messaging plan.
If you are sending to or receiving from a iPhone user, make sure they have SMS and MMS set to not be handled by Apple's iMessage system.
The iMessage system/app on iOS is Apple's internal instant messaging app that only work between other iOS users.
A lot of iPhone users do not know this and try and fail to send or receive SMS/MMS messages properly with other non-iOS devices.