The Brief: Number neighbors are people with the same phone number except for the last digit.

Bluesquiggle
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Number neighbors, also known as “text door neighbors” are people whose phone numbers are “next to” each other. For example, the numbers (123)456-7890 and (123)456-7891 are number neighbors.

Recently a viral trend has been revived in which people text their number neighbors to see what happens and then post screenshots from these conversations online.