How to send sms in laravel to all users if users table city matches with services table city?

I want to send sms to all users in laravel if service's table city field matches with user's city field.

Take a example:- if i submit a form for a service by selecting a city, then it will match with the users city field, if it matches then automatically send a sms to all users with same city..

via Chebli Mohamed