I had to struggle a bit to find out the SMS message counter option in K750i. This is how you get there…
1. Go to ‘Menu’.
2. Select Phone ‘Settings’
3. Go to ‘Calls’ tab
4. There you see the ‘Time & Cost’ -> ‘Message Counter’.
One drawback with K750i message counter is that, it doesn’t have a counter for Received messages, it only shows the sent messages count.