I have the SX66 BA from Cingular. This works for me but in the opposite way as stated by Ehud. A "w" in the string will wait until I press the send key again. A "p" in the string will pause a few seconds and then continue dialing on its own. We use Bellsouth conference lines where you have to enter an asterisk followed by the bridge number and then an asterisk again. And if you are the host you then enter in an asterisk, your host pin code and another asterisk. Both the "p" and "w" work on my SX66.

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SX66 (PH20B1)
ROM: 1.40.00 WWE
Radio: 1.13.00