My own experiments indicate that your guide status and when you call may be more important than which number you call.
Many of the primary numbers may be on this list of AT&T dialup numbers:http://www.southcentralpower.com/bro...ss_numbers.pdf
I really feel that each of these numbers should work as well as any other on this list.
My recommendation is to check the messages and guide each morning, verifying that your guide has been extended one day into the future following the nightly update. If you get a message that the nightly connect failed, no need to check the guide, proceed with forced network connect. If no message, the guide should include a partial day one week from tomorrow. If not, force a net connect. Check the guide after the net connect completes. If you have a partial day one week from tomorrow, you are all set.
If you get 2 days behind, i. e. no guide data at all for one week from today, it is very unlikely that net connect will help. If you have more than one machine on the same phone line, disconnect the phone line from the machine with the incomplete guide. Otherwise, that machine may tie up the phone line with two or more long attempts to download the guide during the night, and cause the other machines to fail to get access to the phone line.
When to Call
Some users have reported that their machines recovered a fresh guide during the nightly update after the current guide became empty.
I've found that I had success downloading a fresh guide using tricks that I posted elsewhere on the forum. I used the same number each time, but some times of day work better than others.