iPhone users have the option to automatically take the calls in Speaker. Listed below are the steps to enable iPhone to receive phone calls in Speaker.
Step 1: Tap the Settings icon on the Home screen.
Step 2: Navigate to General option in Settings screen.
Step 3: Select Accessibility option in General Settings screen.
Step 4: Scroll down the Accessibility screen and pick Call Audio Routing option.
Step 5: Scroll down the Accessibility screen and pick Call Audio Routing option.
Now you should be automatically pick the in iPhone Speaker mode.
When most of the times you are busy with work and would like to answer calls in Speaker phone then this would be a quite useful option.