ZDNET's key takeaways Use these codes to forward calls, pay your bill, check balances, etc.Some of the codes work only on certain carriers or devices.One of the codes also might erase your data, so ...
Trace Dominguez on MSN
How Dial-Up Modems Used Sound to Talk to Each Other
Those chaotic screeches of dial-up weren’t random — they were data, tones encoding handshakes, carrier signals, and sync pulses that connected millions before broadband existed.
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