To keep the SIM active, you have to keep recharging it to extend validity. Every network has cheap plans specifically for this. Airtel has a INR 23(€0.3) plan that extends validity by 28 days. Other networks like Vodafone have similar plans (INR 35 or €0.4). You can recharge from websites like Paytm or Freecharge.
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Phone number. +49. Continue. With MobileRecharge, it's easy to make your family and friends happy! It only takes seconds to recharge a mobile in Germany. Fast and secure mobile recharges, exciting bonuses and more. Choose your destination number and send top ups to any mobile in Germany. Recharge their mobiles online and surprise your family