For quite a while the iPhone was actually behind the curve in a couple key ways, even from the more standard cell phones. When most phones had the ability to send and receive picture, or MMS, messages, the iPhone did not have this feature. Now that the iPhone has reached some level of maturity, this comes standard on the device right out of the box. If you are looking for how to receive texts with pictures on the iPhone there are a few key ways to ensure that this is working correctly, and ways to troubleshoot it if it is not.
iPhone picture messaging should be enabled on the iPhone right from the start and is regulated by a basic messaging setting. In Settings go down to the third block of options and choose Messages, which is right below Safari and above Music. Here you will be able to regulate your message settings such as whether or not you want iMessages activated and regular SMS messages. You may want to turn off iMessages if you have limited available data on your iPhone data plan, or turn off SMS messages if you have no more regular text messages available.
Towards the bottom of the options will be a few on / off switches that allow for different things. MMS Messaging is the top of these, and you want this to be set to On. This will allow you to send and receive image and video messages. If you are not able to send or receive these then this is the first place to look when you are troubleshooting or figuring out how to receive a text with pictures on the iPhone.
If you have a picture or video that you want to send in an iPhone MMS message then you will start by going into Photos. Go to the Camera Roll, or wherever the file is saved, and then locate it. Once you open it go to the lower left hand corner and select the button that looks like a curved arrow leaving a rectangle. This will give you several options such as sending it in a Message, emailing it, assigning it to a Contact, using it at your iPhone wallpaper, Tweeting it, or printing it.
Once you select Message it will open up a message prompt with the photo or video in the content block. You will then enter in a number or assign a contact that it is to be sent to, and then send it as you would with any message that you have typed. This will take a little bit longer, so it may be a moment before the file is actually sent to the recipient.