How to open browserSync on another device?

Question

Grunt.js

Good day, I have a question. I am using browsersync in gulp. The settings are as follows:

gulp.task('sync', function() {
    browSync ({
        server : {
            baseDir: 'app'
        },
        port: 88,
        notify: false,
        host: '192.168.1.1'
    });
})

Everything works fine on the computer, but not on the phone. The firewall is disabled, tried with and without the host parameter. I connect via External by entering port 88. What could be the problem?