Text messages are not coming to iPad

Hi all,
I am having an apple iPhone 5S and iPad Mini Retina Display through Verizon. Both are doing great work!
The only issue I am having now is that the text messages which are coming to my iPhone are not coming into my iPad. It use to come before, but recently I have changed some settings it seems but couldn't recollect what I have caused this issue.
Did anybody faced this issue before? Any help in this will be greatly appreciated. Thanks so much in advance.
