The following applies to the GSMA network ONLY. All other Red Pocket networks fully support MMS on iOS devices.
Picture and group messaging (MMS) will work if you are using iMessaging on your iPhone (i.e. sending and receiving pictures to or from another iPhone). However, it will not work if you are trying to send and receive pictures to or from an Android or other non-iPhone device.
There are several easy-to-use apps that can accommodate picture messaging. Here are a few of the most popular apps: