Q: Why did I receive a text from my bank for a $.99 charge for iTunes. com/ bill?

it should come from Apple

use this link to review the purchase and verify with your bank they sent this

See your purchase history in the iTunes Store on a Mac or PC - Apple Support

otherwise it could be a scam.

iTunes Store charges on credit and debit card statements - https://support.apple.com/HT201382 - "See an unfamiliar iTunes Store or App Store charge? Before you contact Apple, check your iTunes Store purchase history for more details."

iTunes Store & Mac App Store: Seeing your purchase history and order numbers - http://support.apple.com/HT204088

iTunes Store & Mac App Store: About payment card authorization holds -  https://support.apple.com/HT201292 ~$1 to verify card, later removed.  Also for Apple Music trial - https://discussions.apple.com/message/29203952#29203952

Try looking at your account's purchase history, nobody on here will know what it's for : See your purchase history in the iTunes Store on a Mac or PC - Apple Support

If this is a new account, or a new card, the charge is to ch ck the validity of the information you provided. It's called a Hold and will be reversed within a couple of days.

About payment card authorization holds in the iTunes Store - Apple Support

You can also log into your iTunes account and check your purchase/billing history to see what's it for. A recurring subscription, perhaps?