Making a call on iPhone is as simple as choosing a number in your contacts, or tapping one of your favorites or recent calls.
Add favorites. With Favorites, you can make a call with a single tap. To add someone to your Favorites list, tap 
. You can also add names to Favorites from Contacts. In Contacts, tap Add to Favorites at the bottom of a card, then tap the number to add.
Delete a name or rearrange your Favorites list. Tap Edit.
Return a recent call. Tap Recents, then tap the call. Tap 
to get more info about the call, or the caller. A red badge indicates the number of missed calls.
You can also reach recent and favorite people you’ve been in contact with from the multitasking screen—just double-click the Home button.
Dial manually. Tap Keypad, enter the number, then tap Call.
Paste a number to the keypad: Tap the screen above the keyboard, then tap Paste.
Enter a soft (2-second) pause: Touch the “*” key until a comma appears.
Enter a hard pause (to pause dialing until you tap the Dial button): Touch the “#” key until a semicolon appears.
Redial the last number: Tap Keypad, tap Call to display the number, then tap Call again.
Use Siri or Voice Control. Press and hold the Home button, say “call” or “dial,” then say the name or number. You can add “at home,” “work,” or “mobile.”
“Call Emily’s mobile”
“Call the fire department”
“Redial that last number”
When voice dialing a number, speak each digit separately—for example, “four one five, five five five….” For the 800 area code in the U.S., you can say “eight hundred.”
Use Wi-Fi Calling on your iPhone. (Available with some carriers) Go to Settings > Phone > Wi-Fi Calling, then turn Wi-Fi Calling on This iPhone on. Wi-Fi Calling can be helpful when your iPhone has a low cell signal because it uses your Wi-Fi network to make the call.