Frank pegou UP? to na dentista com reggie. marquei cita com medico no 18 de agosto mas nao com upton
from a 619 phone number, Monday, August 9, 7:08 PM ESR

I have decided this is Portuguese. Which means, according to Babelfish, that it translates as follows:

Frank caught UP? you in the dentist with reggie. I marked quotation with I medicate in the 18 of August but not with upton

So now we know.