Assuming this is the only relevant post on this thread,
MovieFan1995:
I need to pair mobile app with bluetooth module
I am going to send data from the arduino to app
which module should I use ?
hc-05
hc-06
?
Either will do. You might find the following background notes useful.
http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino