Does anyone know what happened to android.provider.Telephony
? It is not there anymore.
I was able to send an SMS message with the G1 using the following library: android.telephony.gsm.SmsManager
So at least (for the SMS send/receive code) there is an equivalent library available.
Also be sure to check out the TelephonyManager http://code.google.com/android/reference/android/telephony/TelephonyManager.html
This isn't exactly what you were asking about, but it does provide a lot of the functionality you're looking for.
As for the APress book reference in the answer above, I wrote it. As of right now, it's a little out of date (It was published before the 1.0 SDK was published) and I'm almost done updating it. Ahhh the joys of rapidly updating technology.