how do i find the provider behind this cell phone number?

[holyjuju22]

i wanna text this guy from yahoo mail but its saying they don\'t work with his provider. i want to find a website where i don\'t have to enter his whole number (for like safety) but i can enter like the first couple digits and it will tell me what provider he has. like if he has AT &T, Verizon, T mobile ect.


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