I have never used Whatsapp and know diddly-squat about it but surely all of his whatsapps to RS remained on her phone together with her answers. That may have been the reason he tried to use RS's phone but he couldn't get past the lock code. He must know you can phone an emergency facility on an iphone so his excuse for not being able to do so was another one of his lame lies. So what was on his phone that he didn't want anyone to find out. Whatsapps between girlfriends and he which may have shown his infidelity? What else would make him wish to erase the contents? Any ideas?
IMO exactly that. And they would have occurred when we see the 3 GPRS activations post-22:30 through to 01:48. This proves not only is he awake but also gives credence to the argument heard by EvdM. Reeva has spotted what he's up to and an argument ensues that ultimately leads to Reeva being shot. And if we had the content we'd know for sure.
And if this scenario is what happened then there is at least one other person complicit in withholding evidence.