Local SIM cards can be purchased at international airports immediately upon arrival, typically at official telecom provider kiosks located in arrival halls before or after immigration clearance. Major airports feature multiple telecom provider counters offering prepaid SIM packages with varying data allowances and validity periods ranging from 7 to 30 days at competitive prices. Valid passport and visa documentation are universally required as identification when purchasing SIM cards, with photocopies of passport information and visa pages usually sufficient for processing. Some countries require additional documentation including passport-sized photographs (typically 1-2 copies), proof of local address such as hotel booking confirmations, and occasionally reference information from local residents. Outside airports, SIM cards can be purchased at authorized retail stores, supermarkets, convenience stores, and official telecom shops often at lower prices than airport counters. Certain countries enforce specific regulations requiring SIM card registration with biometric data, fingerprint scans, or local addresses, so researching destination-specific requirements before assuming easy purchase access is advisable.