We shouldn't send them THIS then:
Text Messaging & Chat Abbreviations "Numbers & Characters"
?     I have a question
?     I don't understand what you mean
?4U  I have a question for you
;S    Gentle warning, like "Hmm? What did you say?"
^^    Meaning "read line" or "message above"
<3     Meaning "sideways heart" (love, friendship)
@TEOTD    At the end of the day
.02     My (or your) two cents worth
1TG, 2TG     Meaning number of balls needed for win (online gaming/Bingo)
121     One-to-one (private chat initiation)
1337     Leet, meaning 'elite'
143     I love you
1432    I love you too
14AA41     One for all, and all for one
182     I hate you
10X     Thanks
10Q     Thank you
1CE     Once
1DR     I wonder
1NAM     One in a million
2     Meaning "to" in SMS
20     Meaning "location"
2EZ     Too easy
2G2BT     Too good to be true
2M2H     Too much too handle
2MI     Too much information
2MOR     Tomorrow
2NTE     Tonight
4     Short for "for" in SMS
411     Meaning "information"
404     I don't know
411     Meaning 'information'
420     Lets get high
420     Meaning "Marijuana"
459     Means I love you (ILY is 459 using keypad numbers)
4AO     For adults only
4COL    For crying out loud
4EAE    Forever and ever 
4NR    Foreigner 
^5     High-five
511     Too much information (more than 411)
555     Sobbing, crying. (Mandarin Chinese txt msgs)
55555     Crying your eyes out (Mandarin Chinese txt msgs)
6Y     Sexy
7K     Sick
81     Meaning Hells Angels (H=8th letter of alphabet, A=1st letter of alphabet)
831     I love you (8 letters, 3 words, 1 meaning)
86     Over
88     Bye-bye (Mandarin Chinese txt msgs) 
88     Hugs and kisses
9      Parent is watching 
*s*     Meaning "smile"  
*w*     Meaning "wink" 
MORE FOUND HERE A-Z:
http://www.webopedia.com/quick_ref/textmessageabbreviations.asp