Would it not just be easier to knock? You may be thinking well, not always... I like to arrive secretly and make a discreet entrance, or I'd hate to alert their parents to my arrival. Whatever you motives are, texting inappropriately is a mass abuse of mobile privileges and shows intent of gross misconduct. You can even text for a taxi these days which has brought mobile technology into dangerous grounds. If you disagree, text "DISAGREE" to 0783633892.