Knowroaming is offering a SIM card for $9.99 with Free unlimited data for WhatsApp ONLY. Unlimited data packages start at $7.99 a day but not required if you just want to use WhatsApp.
You must have an unlocked GSM phone and speeds are only at 3G.
Once I got the sim, they require you to download their app to register the sim. They ask you that you must load account with credit in order to use the sim but you can SKIP this step. I just had to change the APN setting and WhatsApp worked great. WhatsApp texting quality was good but voice was lagging a couple of seconds. WhatsApp Video was very choppy but they just started to support video recently so I hope they'll work out all the bugs.
Promo Code: BRILI86 ($3.00 OFF SIM)