Chris of AppleiPhoneReview.com reports that a not-yet-released Cingular iPhone ad is revealed in a private iPhone consumer survey conducted by the folks from Pinecone Research.

According to the said ad, there is a probability that the 4GB would hit at US$ 299, and the 8GB will be around US$ 399, and that this would be an on-contract price.

Of course this pricing information is coming out of a survey, so perhaps this is just to test consumer reaction. Still, this looks pretty promising. However, as it stands, we still have to wait for the powers that be to give official and solid word before we start gauging how much our wallets will be damaged come the release of Apple's iPhone.

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UPDATE: As pointed out by neok182, the survey that we have above may be a fake and may actually have nothing to do with either Apple or Cingular. Meanwhile, while there are still no conclusive reports which outrightly proves the ad to be a fake, there have been comments in various news sites which point out several inconsistencies.

For one, the survey lists Cingular's Data Plan at US$ 4.99, when it is supposed to cost at least US$ 19.99 a month (if the iPhone gets classified as a SmartPhone) or US$ 49.99 a month (if the device ends up classified as a PDA). People have also noted that only Cingular's basic Text Messaging plan comes at US$ 4.99.

Hence, this article now falls under the "should be taken with a grain of salt" category.