Unlike Overwatch 2, Modern Warfare 2's mobile phone requirement is

Console players aren’t subject to the same SMS security policy as PC…

Overwatch 2 ditches phone requirement after fan outcry

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Activision Blizzard tweaks SMS Protect to support pre-paid phone plans

Minimum and Recommended System Requirements for Call of Duty: Modern Warfare on PC, cod 2 modern warfare system requirements

Modern Warfare 2 has the same 'no prepaid phone' requirement as Overwatch 2 : r/pcgaming

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Modern Warfare 2 will require players to link their phone number [updated]

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Overwatch 2 Will Record Voice Chat, Requires a Phone Number to Play : r/KotakuInAction