Does Xbox Live Work on Dial-Up Internet?

No. Xbox Live will not work reliably on dial-up.

Why Dial-Up Fails

• Speed: Dial-up is far too slow. Xbox Live requires a minimum 3 Mbps download; dial-up maxes at ~56 Kbps.
• Latency: High ping makes real-time online gaming unplayable.
• Data caps: Limited monthly allowances would be exhausted quickly by gaming traffic.

Broadband internet is essential for a functional Xbox Live experience.