A SIM (Subscriber Identity Module) card is an integrated circuit card used in GSM systems to identify mobile users. It allows GSM networks to recognize subscribers, and the same SIM card can be used across different phones. Without a SIM card , a GSM phone cannot connect to the network. In essence, a SIM card represents a mobile device’s legal identity, much like an ID card . It enables mobile phones and other smart devices to access the carrier’s communication network and services. Buy a new SIM card online with free home delivery. Activate your SIM card instantly using Self-KYC on MyJio App & enjoy seamless 5G. Order Jio SIM now! Buy new prepaid online SIM card with quick home delivery & easy activation. Get your new mobile SIM card delivered to your door. Order your new Vi SIM in easy steps. With the world ‘going digital’, you can now buy SIM cards online. Looking for details? Here's our guide on the requirements and how to buy a SIM card online.