Iphone 4s "Blockade" Imessage CALL help!

hi...

iphone 4s have imessage function

iblacklist can blockade imessage sms? if send message show "sent" it's mean what? success or not, have blockade 4s imessage? friends can see message?

or have other apps can blockade 4s imessage ?

, then, iblacklist can blockade "viber" free call , it's free text message? or have other apps can blockade?

 

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