Here are some tips to protect yourself from SIM swapping attacks:

1. Secure your device: enable a secure lock screen, preferably one with biometric options.
2. Keep track of your phone: be mindful if your device has been out of your control (eg. at a repair shop).
3. Monitor your accounts: regularly keep an eye on your transactions, and contact your carrier if strange activity is detected.
4. Strengthen security: strengthen your passwords and have in place multi-factor authentication, if available.
5. Ensure you're the only contact: inform your carrier that you and only you are authorized to verify your SIM cards or make requests.