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I've had laptops with cellular modems built in going back to Pentium IIIs. The Compaq N600c had a "multiport" bay on the lid, one of the options was a GSM modem

I've had laptops with cellular modems built in going back to Pentium IIIs. The Compaq N600c had a "multiport" bay on the lid, one of the options was a GSM modem.