olemus
üks telefonikelmusi, ebaseaduslik teenuseandja vahetamine kliendi nõusolekuta
= an illegal telecommunications practice, in which a subscriber's telephone service is changed without their consent

ülevaateid
https://www.youtube.com/watch?v=lTkoOBim8Zk

https://en.wikipedia.org/wiki/Telephone_slamming

tõrje
https://www.fcc.gov/consumers/guides/slamming-switching-your-authorized-telephone-company-without-permission

https://www.att.com/esupport/article.html#!/smb-digital-phone/KM1236277

https://corporate.findlaw.com/litigation-disputes/telephone-slamming.html