Technically, yes, you can still use a VPN even if your SIM card is registered. However, it's important to note that using a VPN to commit îllégâl activities is prohibited and may result in penalties or legal consequences.
In some countries, using a VPN is legal but regulated. It's best to check your country's laws regarding VPN use to ensure that you're not violating any regulations.
That being said, depending on your location and the VPN service you use, using a VPN may cause your connection to be slower. This is because the VPN server you connect to may be far away from your physical location and the encryption of your data may cause additional processing time.
Overall, it's important to use a VPN responsibly and for legal purposes.