This is how the real SS7 attack demo page (www.sms-txt.net/ss7-attacks-demos/) of the www.sms-txt.net scam website should look like (click on it to enlarge):
This is how the real SS7 attack demo page (www.sms-txt.net/ss7-attacks-demos/) of the www.sms-txt.net scam website should look like (click on it to enlarge):