Best proven solution for dual sim card + SD card capability : r/GalaxyS8
Speed ZX-Four Nano SIM Quadruple Dual SIM adapter for Android smartphones and tablets Nano SIM format - 5G 4G LTE 3G compatible | SIMORE.com
SIMORE - Multi SIM Adapters for Galaxy
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iPhone 11 Dual SIM Adapter Speed Xi-Twin 11 - DualSIM with protective case - 4G LTE 3G compatible | SIMORE.com
SIMore 2Twin Bluetooth Dual SIM Adapter Active for iPhone iOS and Android OS, Bluetooth dual SIM adapter Dual SIM adapter for iPhone Dual SIM card adapter - Buy Switzerland Bluetooth Dual SIM
Multi-4SIM iPhone Multi-SIM extension adapter Nano SIM - Micro SIM - Mini SIM - IC card formats | SIMORE.com