ExDialer is only real dual SIM dialer. ExDialer focus on usability and ease of access.
Not even a tap required to dial. Dial via SIM 1 or SIM 2 with just swipe left or right.
Send message to whatsapp without even have to save number. Just type the number and send direct message or direct dial whatsapp.
Decide what to do with swipe left or right Call, SMS and whatsapp on swipe.
Fastest and most intelligent contact search, recent or frequent calls, history, everything on just simplest single screen.