I can’t receive any phone calls

1. Check to see that the Silent switch is not set to ON. Silent switch is located on the Top Left Sideof your iPhone.
2. Open Settings ➔ Sounds & Haptics ➔ Ringer and Alerts : Make sure this is not set to OFF or too Low. Set Change with Buttons to OFF. Below that Make sure that there is a Ringtone selected.
3. Check to see that Silence Unknown Callers is set to OFF. Open Settings ➔ Phone ➔ Silence Unknown Callers : Set this to OFF
4. Make sure that a ringer sound is assigned. Open Settings ➔ Sounds & Haptics ➔ Ringtone : Ensure that a Ringtone is assigned here.
5. Check to see that Do Not Disturb is set to OFF. Open Settings ➔ Focus ➔ Do Not Disturb : Set this to OFF
6. If all of the above is OK on your iPhone then Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

Axel F.

DawnPea Said:

"I can’t receive any phone calls: I can make calls but can’t receive calls"

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Troubleshooting Calls:

Any mention of the worlds "No Service"? on your screen?

Troubleshooting iPhone with "No Service":

A. Getting Around this Error:

1. Go Here: If you can't Activate your iPhone - Apple Support
2. As it Reads: "If your iPhone can't be activated or an alert says the activation server is unavailable or the SIM card is unsupported, learn what to do."

B. "No SIM":

"No SIM"*** is shown on the top-left corner of your screen. So, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

C. Whom to Contact:

Contact your Carrier, as their are the one who provide you with the service of configuring the SIM card: