Check your country’s official telecom regulator website or app
Use the national SIM verification portal, if available
Log in with your national ID or passport details
View the list of SIMs registered under your name
Contact your mobile network operator’s customer care
Visit a carrier store with your ID to request a SIM count
Use SMS or USSD SIM-check services provided by your telecom authority, if available
Review any official messages or alerts from carriers about registered numbers
Report any unknown SIMs to the telecom operator or regulator for deactivation