Good idea about restoring the phone. If he jailbroken some how without her knowing, he could have installed something.More importantly, is she cheating on him? Just kidding. You'll want to help or have her:
1) Update her firmware or reset all settings and restore from iTunes, just in case her phone has been compromised.
2) Reset her Apple ID password, AT&T account password and her e-mail account password for good measure.
3) Set or reset a passcode for her phone.
4) Punch your dad in the face (optional).
You can only view talk and message history (and NOT content) through the AT&T site. Good luck!
You can get full content of the texts (and even calls?) simply when logging into AT&T's account online?
I've certainly seen the numbers that are involved being provided, but never the actual content itself of what was in the messages (and not sure how the content of calls would even be provided--all calls are being recorded and/or transcribed?).
I've been trying to find some information about this, as it sounds interesting (and/or odd in a sense), but everything I've come across seems to point to only dates, times, numbers, and information of that sort being provided, and not the actual content.
Consider the implications of a phone carrier allowing access to the content of all text messages on their website, which any customer can access. Wishful thinking (maybe?) won't change the answer you've found already.
