iPhone: Cingular Ready for June - Vodafone, Orange or T-Mobile in Europe?

One of our readers in Canada sent us an email originating from Cingular/AT&T and confirming the availability of the iPhone for June while giving specifications of the device it did not provide further technical details.
If the introduction of the iPhone is planned and organized in USA, it remains a completely opened question in Europe. While Pascal Cagni mentioned the introduction for the end of the year, the choice of the carrier remains unclear. As we already reported it, if Apple plans to team up with a single carrier, then it will most probably be Vodafone (UK) or Orange (FR). However, a german mobile phone online shop is advertising the iPhone as part of a T-Mobile subscription offer to be announced!