What do this phone number do?

I got this spam on craiglist.org and i want to know if anybody knows why they want you to call them? I have an idea but since i am not in the USA i want to be sure.

This is the email

Hi my name is Sandy & I’m seeking true love.My hobbies are singing drawing & one day travel all over the world.I’m going back 2 school 2 get a degree in Graphic Communications.
If you have the time please call me @305-446-1392 or 305-257-3471

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