This development just crop up recently. I on my phone 1 morning, only 2 realise dat all my applications had been corrupted. I suspected virus so I restored factory settings(I always do dis to get rid of virus). Afta dat, d phone was ok but wen I tried downloading, i had this error msg: DOWNLOADING FAILED: NO CERTIFICATE ON PHONE OR SIM.

I realise dat any appliction on my phone appliction folder'll b corrupted. I only sent some applictions 2 received fold n use them there.

Pls watz d problem n how can it b fix. Thx.