I’ve been having this problem with my Tilt wherein the phone would ring twice and go immediately to voicemail. Unless I had my phone right in front of me, or had my Bluetooth headset on, I was missing calls right and left. Annoying.
I had called Cingular / AT&T wireless customer service a couple weeks ago per the following instructions on their website:
QUESTION:
How can I adjust the number of times my wireless phone will ring before the caller goes to voicemail?
ANSWER:
Contact Customer Care at 1-800-331-0500 or dial 611 from your wireless phone to change the amount of time your phone will ring before going to voice mail. The adjustments made by Customer Care are based on the traditional ring heard by the caller, not the unique Ringtone you hear from your phone.
… but when I called back this AM, my ring delay before voicemail was still stuck on 10 seconds. BAH! I had them update it (again) to 20 seconds, and now I get three full rings. I think I’ll call back and ask them to bump it up to 30 seconds, which is the maximum.


Very helpful! Thank you, I was going nuts not being able to answer my phone in time!