Can you use juice defender and android booster together? What are the advantages of using these apps. Have installed both on my phone, but not so sure if that was wise... Also would like to be able to have only whatsapp using my packet data, not any other apps (like facebook, gmail etc). How can I set my galaxy ace (2.3.3) for that? I had Nokia 5230 previously and could set within whatsapp so that network roaming only for whatsapp, nothing else. Helped with saving on my airtime... Help will be appreciated. Very new to android (only got my upgrade phone last week). Many of my friends and family hav blackberry and are able to send whatsapp msgs for free (using BIS), and I would like to be able to communicate with them for less than standard sms costs (therefore using whatsapp).