Names not shown from number anymore All of a sudden, half-way using whatsapp, the names are not shown anymore. Instead I can only see the number. I went to my contact list and checked. 

Most of my contacts appeared to be shown in email address. And it's the same person's email address. 

I clicked in and found that the detail of these contacts is gone. 

What happened to my phone and what should I do? 

My phone is Galaxy Note2
In Settings > Contacts > Show all contacts should be disabled which was the case for me but still had same problem. So I enabled "Show all contacts" and exited whatsapp. Launched Whatsapp again and disabled 'Show all contacts' and got the names back again instead of just phone numbers. Hope my experience helps.