Why for 4 days phone says no service, my whole towns like this?

If your whole town is out of service, than clearly the problem lies with the carrier and not the phone. Contact your cellular carrier and let them know.

If you see No Service or Searching on your iPhone or iPad

1. Check your coverage area. Make sure that you're in an area with cellular network coverage. ... 
2. Restart your iPhone or iPad. Restart your device. ... 
3. Check for a Carrier Settings update. ... 
4. Take out the SIM card. ... 
5. Reset your Network Settings. ... 
6. Update your iPhone or iPad. ... 
7. Contact your carrier. ... 
8. Get more help.

If you see No Service or Searching on your iPhone or iPad ...

Remove your SIM card from the SIM card tray and then put the SIM card back. ... Make sure that the SIM tray closes completely and isn't loose. If you use a SIM tray from a different model iPhone, iPad, or from another phone manufacturer, it might not fit properly.

If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad ...

Learn what to do if you see a SIM not supported alert.

If you see No Service, Searching, or SOS on your iPhone or iPad

1. Check your coverage area. ... 
2. If you see SOS or SOS only. ... 
3. If you're on 3G network. ... 
4. Restart your iPhone or iPad. ... 
5. Check for a Carrier Settings update. ... 
6. Turn your cellular line off and back on. ... 
7. Reset your Network Settings. ... 
8. Update your iPhone or iPad.

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If you see No Service, Searching, or SOS on your iPhone or iPad

To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.

You may have a bad or damaged SIM

You may have a Carrier Locked iPhone.