iPhone 4 How To: Insert / Remove a SIM Card - YouTube
iPhone 4S Owners Reporting SIM Card Problems
How to Insert SIM card in iPhone 4 / 4S / 5 / 5S / 6 / 7 / 8 / SE
SIM Card Not Detected by Your iPhone - The iPhone Book: Covers iPhone 4S, iPhone 4, and iPhone 3GS, Fifth Edition [Book]
Retro review: I bought an iPhone 4s and spent a day with it | Technology News,The Indian Express
R-SIM9 PRO For iphone4S/5/5C/5S iOS7.0-7.X unlock instructions R-SIM15,R-SIM14,GPP,GEVEY,HEICARD,HEISIM,RSIM 10,RSIM11+,RSIM 9 PRO mini air Unlock,iPhoneX,iPhone8,Firmware,Any version, No jailbreak