Apple's iPhone 7 might include dual SIMs, keep standard audio jack - CNET
iPhone 7 Plus Dual SIM Adapter Speed X-Twin 7 Plus - DualSIM card with protective case - 4G LTE 3G compatible | SIMORE.com
WX-Five 7 Plus - Multi dual SIM case adapter for iPhone 7 Plus - 4G 3G compatible | SIMORE.com
Dual Sim Dual Standby Bluetooth Adapter For Iphone 7/7plus Goodtalk Phone Shell Ultra-thin Back Clip Battery 2500mah Power Bank - Battery Charger Cases - AliExpress