Nope, your SOL with the Cell Socket on 2 counts.... (I have one myself)
-First, there is NO way (not that YOU can do anyway) to put an # in the internal dialing string in any D* receivers to be dialed AFTER the destination# has been dialed. Usually you can put in digits BEFORE this number, like a 9, etc - but obviously this won't help you.
-Even if you COULD do this, you would most likely never get a connection made - if you read your instructions in for the CS, it will even tell this (will not work with modems, Tivos, etc) Digital cell phones don't pass analog modem signals well at all.
But in reality, you really DON'T need to even worry about this - while D* puts the phone BS in it's brochures, your system, other than NOT being able to order PPV by remote, will work just fine otherwise, INCLUDING getting ST. If you want to order PPV, just order it from D*'s website & it will get instantly turned on to ALL your receivers at once.
Enjoy your new D* system & welcome to SatGuys...
