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Hello friends!
I see the error!!
When i put:
$sql = "INSERT INTO 'contactos' ('id', 'nombre', 'telefono') "
We don't use simplfy quotation maks or double quotation marks, y must use this quotion marks: ``. If you don't use this, the form make error!!
Just wanted to mention, in case other folks stumble here, that this is not the way you should structure your DB queries in PHP.
http://php.net/manual/en/security.database.sql-injection.php