Amazon.com: 6 in 1 Sim Card Adapter Kit (Micro, Nano and Standard Sim) Compatible with iPhone X, 8,7 All iPhone Series, Samsung, HTC, and All Other Android Smartphone Devices by Mobi Lock :
Apple iPhone 6 16GB GSM Unlocked - Space Gray (Used) + Ting SIM Card, $30 Credit - Walmart.com
iPhone 6 Plus Dual SIM Adapter Speed X-Twin 6 Plus - DualSIM card with protective case - 4G LTE 3G compatible | SIMORE.com
Remove or switch the SIM card in your iPhone - Apple Support
Apple iPhone 6 / 6 Plus - Insert / Remove SIM Card | Verizon
OEM SIM Card Tray for iPhone 6 Plus Silver
Apple iPhone 6S 16GB (Verizon Unlocked) Rose Gold + AT&T $45 Prepaid SIM Card (1 Month Service)
Iphone 6 Plus Sim Card - Best Buy
IKOS Two Active SIM Cards Adapter For iPhone 6 7 8 X XS MAX Dual SIM Cards Bluetooth Standby Adapter For iPod iPad No Jailbreak|SIM Card Adapters| - AliExpress
iPhone: Apple iPhone 6 and 6 Plus Now Sold SIM-Free | Time