iPhone says "No Service"

see this Apple article: If you see No Service or Searching on your iPhone or iPad

If you see No Service or Searching on your iPhone or iPad - Apple Support

EdenAbebu Said:

"iPhone says 'No Service': I buy used iPhone 6pluse than I used it 1month and I reset in but it is not working the network it’s says no service what can I do please help me I’m from Africa"

-------

Whom to Contact:

Contacting your Carrier:

Contact your Carrier, as they are the one who provide you with the service of Cellular.

Contacting Apple in Africa:

• Contact Numbers in Africa: Contact Apple for support and service - Africa - Apple Support
• Chat with Apple: If this is of no luck, contact Apple Support directly. Go to: support.apple.com From there, select Get Support. Log in and then, perform a chat session with an Apple Rep, requesting assistance with "No Service"