Apple iPhone 6s, 6s Plus: Should you upgrade? It depends
Some will always want the latest and greatest iPhones; Apple
Review: Apple's iPhone 6s + iPhone 6s Plus are nice but definitely not mandatory upgrades [Video] - 9to5Mac
Upgrading From an iPhone 6S to an iPhone 6S Plus
Differences Between iPhone 6s vs iPhone 6s Plus: EveryiPhone.com
iPhone 6s - Technical Specifications
The iPhone 6 Plus is now considered obsolete by Apple
Is buying an Apple iPhone 15 the best choice in USA? - Quora
How much does it cost to repair an iPhone 6 or iPhone 6s? - Swappa Blog
iPhone 6S review: Good in many ways, but it'll benefit a lot from iOS 12
Apple iPhone 6 review
Review: Apple's iPhone 6s + iPhone 6s Plus are nice but definitely not mandatory upgrades [Video] - 9to5Mac