I have a iphone 3gs. Im using it with cellularone sim card. I can recieve a picture with a text but when I try and send one an exclamation point comes up any advice out there.
Call your carrier and ask them to know how to check your data package information, also to provide you with the MMS settings information. If you still have data package availble and the MMS settings in the APN are corrects, then you should be able to send MMS.
This is how your message thread window should looks like if the settings are correct.