Compulsory registration requirement: importers must verify BIS registration and valid IMEI/ESN/MEID before clearance. Imported notified electronics must bear the Standard Mark and a unique BIS registration matching product, brand, model, manufacturer and manufacturing location verifiable on www.crsbis.in; GSM handsets without valid IMEI or with all-zero IMEI and CDMA phones without valid ESN/MEID or with all-zero ESN/MEID are prohibited, and Customs and trade participants must increase vigilance to ensure compliance with the CRO and mobile import policy.