What Are The Steps To Set Up Data and Text Messages On An Unlocked iPhone 5?

The phone will typically come with those enabled.

You have to get a sim from the carrier and sign up with one of their plans, after that it's pretty much automatic.

beeinformed said:

Are you sure the phone typically comes enabled with the data and text messaging as I have T-Mobile service and have read in an article that the setup is difficult to do on the T-Mobile network?

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You have been misinformed.

U maybe getting feeback fr Grandpa. In the ole days of flip phones and the dawn of cellular data it was a little hairy back then yes.

Pop the sim,make sure cellular data is turned on,you are good to go

refer to the documentation on T-mobile web site

You will need to follow the instructions to set your APN etc by following T-mobile's instructions. Putting the sim card will allow phone and data (if you have a plan) and imessaging. For SMS and picture messaging you need to follow instructions outline on the t-mobile web site. I am not sure if web links are allowed but here is the link to T-mobile documentation for an iPhone.
http://support.t-mobile.com/docs/DOC-2383

I know this is totally insane and probably won't work, but have you tried calling T-Mobile?

Interstella5555 said:

I know this is totally insane and probably won't work, but have you tried calling T-Mobile?

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That is insane.