Why has my iPhone eaten up All my data?

I have unlimited data with 27.5 gigs of storage and only around 7 gigs of pics, apps, etc but it says my storage is almost full! And when I delete stuff it just eats the data I freed up! Without me doing anything either it does it on its own. Please give me some sort of idea as to what's going on. Going to the AT&T store is the last thing I want to do.

So look and see where its all being used.

When you delete stuff, isn't it copying it to your 'cloud storage', then deleting it off your 'phone?

The unlimited data doesn't refer to 'storage'.it's what you use in real time.

"it says my storage is almost full"

I see these questions posted all the time. People would really make things easier for themselves if they read answers to past questions before adding their question to the pile. Even if you didn't find your answer, you'd at least see what info should be in your question.

One of the most important details is also one of the least included details - what iTunes says your memory is being used for. ITunes gets a lot of complaining from people who don't bother to learn how helpful it can be. If you look at that memory bar it will tell you how much is being used for music, video, apps, etc.

That detail matters.

"when I delete stuff it just eats the data I freed up! "

Do you update your iPhone by syncing it? The reason I ask is because 1) most people who post questions here do that (and unsurprisingly syncing is the cause of a lot of those problems) and 2) when your iPod is NOT set for manual management of music and video, iTunes may reserve as much space on your iPod as is needed to store in it everything in your iTunes. This has been a feature of iPods for years. My son had that problem with his iPod Touch a couple of years back - enabling manual management freed up GB's of space.

Is "other" taking up more than 1 GB of space? If so deleting "stuff" (whatever that is) won't help. Try clearing the safari cookies and history (in settings) and then doing a full shut down and restard.

If none of that helps, repost this question including those details.

Also, although they are conceptually related, the iPhone isn't eating data. "Data" in terms of phones typically refers to data downloaded between the phone and network (3G, LTE or Wi-Fi); your question is more accurately "I don't know why I'm running out of memory on an iPhone"