Backup your config.
Reset to default an test.
If everything is ok then track which part of your config is causing the issue.
And which mobile operators?We're in 2019 and mobile operators sell 50GB/month for 5€, who needs hotspots anymore?
/interface wireless set wlan1 wps-mode=push-button
add action=reject chain=input reject-with=icmp-admin-prohibited
/ip firewall filter add chain=forward action=fasttrack-connection connection-state=established,related /ip firewall filter add chain=forward action=accept connection-state=established,related