It was not that long ago TiPb passed along some warning signs we’d seen about AT&T cracking down on iPhone users who currently not on an iPhone data plan. Well they’ve gone and given all of you rebels out there one more warning for good measure.

After some digging around in AT&T’s myWireless application, we have found yet another dose of legalese from AT&T that states they can and will change your data plan and charge you accordingly if you are currently using an iPhone with any data plan other than the iPhone data plan.

While this is nothing earth shattering, we figured we would pass it along so, if AT&T started following up on the warnings, our readers wouldn’t be caught by surprise.

Switch to the appropriate data plan or possibly end up with a larger than normal bill? We know iPhone data use is hammering AT&T’s network, but is this the best way for them to go about things?

Today AT&T’s very own application, myWireless, was released in the the App Store for all AT&T subscribers to download. myWireless [iTunes Link] is a crafty little app that lets iPhone users manage their AT&T accounts easily from the device itself. You can view your data and minutes usage, view and pay your bill, and you can even add and remove extra features like text messaging and early nights/weekends, all from the comfort of your very own iPhone.

I’ve tested it out and pretty much any option on AT&T’s website is built into this app. You can even access your full detailed bill via PDF file.

It is important to note that you must have an active AT&T Mobility account that is registered for online account management in order to use this application.