According to a DigitalPoint Forums thread, Google has updated their AdWords policy to require that all ringtone ads contain pricing details directly in the ad copy.
I tried to find any official updated documentation from Google on this new policy, but was unable to do so. Thus, this is not confirmed yet by Google but honestly, it would not surprise me, if this was indeed a new policy.
The email received by this advertiser was:
"...we will require text and image ads for these services to display the price and billing interval (such as per week or per month) in the ad text, e.g., '$5.99/month.' We will no longer accept text or image ads that don't contain the price and billing interval when promoting mobile content services..."
As you can imagine, some ringtone advertisers are upset about this policy change. Supposedly, all ads without this that advertise for ringtones, will be rejected.
Forum discussion at DigitalPoint Forums.