Why can't I send pictures on messaging?

[Android Central Question]

I can send messages to friends but it won't let me send pictures. It tells me sending, but it keeps saying sending?

 

[chanchan05]

Do you have data on? Do you have MMS services active?

 

[Rukbat]

Is your APN set correctly according to the carrier's (or MVNO's) requirements? (You can check it in Mobile Data in Settings.)

Are the pictures small enough to go by MMS? (You're limited to 300KB or less.)