SIM swapping attacks have gained popularity and are very useful to threat actors that already have breached credentials but get stopped from accessing accounts via Multi-Factor Authentication (MFA). MFA is always a recommended tool to add another layer of defense to credential theft, but it is typically recommended that MFA is provided through a trusted third-party application and never through a phone number. SIM swapping attacks are great example of why it is dangerous to have MFA set up via SMS messaging. Accounts that are currently set up with MFA through SMS should consider switching to a third-party application before they fall victim to an attack such as this.
https://www.bleepingcomputer.com/news/security/verizon-notifies-prepaid-customers-their-accounts-were-breached/
