Two quick ways to search numbers with your iPhone

Widget search:

Do the following steps to activate auto copy search from widget.

1. Pull down (from top of your screen) to reveal the widget.

2. Edit

3. Enable it by pressing on the +(plus) next to Truecaller

Inbuilt call log search: 
1. Find a number you want to search from your call log. Tap on ( i ) icon next to a number you want to search. Now tap -

2. Share

2. Three-dot menu

3. Add Truecaller. 

4. Truecaller will now be added to in that list to make quick searches