• http://www.apple.com/iphone/
• http://support.apple.com/manuals/iphone
• http://support.apple.com/kb/HT1222
• iPhone
• iOS
• App Store
• iphoneclub.nl → 16GB iPhone 3GS (wit of zwart): €575
• phoneshop.nl → 16GB iPhone 3GS (wit of zwart): €791

• iPhoneClub → http://www.iphoneclub.nl/

• https://www.apple.com/shop/iphone/iphone-upgrade-program
• https://www.apple.com/retail/iphone/forms-of-id.html
• https://www.apple.com/iphone/trade-up/
• https://www.apple.com/retail/infiniteloop/
• iPhone Upgrade Program (US: $40.75/mo. for 24 mo.)
• Buy iPhone 8 gold 256GB SIM-free → 849 USD

• http://www.carinasoft.com/products/skyvoyager/skygazer.html
• http://www.carinasoft.com/products/skyvoyager/index.html
• http://www.carinasoft.com/products/skyvoyager/telescope_control.html

• http://klauskjeldsen.dk/2008/08/05/iphone-3g-disable-slow-itunes-backup-mac-and-windows/

defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool true

• http://picasaweb.google.com/m/

• http://www.softwarebbs.com/wiki/IPod/iPhone/iPad_To_Computer_Transfer_%26_Backup_Software_Reviews
• http://www.iphoneclub.nl/iphone-tips/synchronisatie/maak-een-backup-van-je-sms-berichten/
• http://www.iphone-sms.com/
• http://forums.macrumors.com/showthread.php?t=329813

• https://www.apple.com/feedback/iphone.html

• What is the best bluetooth headset for iPhone 5?
• http://www.igeeksblog.com/best-iphone-5-bluetooth-headsets-for-a-comfortable-experience/
• The 10 Best Bluetooth Headsets
• http://www.hrdlpn.nl/bluetooth-hoofdtelefoon/
• http://www.headsetshop.nl/category/196772/bluetooth-headset.html
• http://www.bluetoothkoptelefoon.com/
• https://www.headsetwinkel.nl/klantenservice/informatie/bluetooth-headset-keuzehulp/

• http://www.headsetshop.nl/product/455620/plantronics-voyager-edge-carbon-black.html
• http://www.plantronics.com/nl/product/voyager-edge?skuId=sku6710015

• run (converted) iOS apps on Xpadian → http://www.xpadian.com/about.html

• XCode is Apple's native IDE tool to develop iOS apps
• https://developer.apple.com/xcode/
• https://developer.apple.com/swift/
• https://developer.apple.com/library/ios/referencelibrary/GettingStarted/RoadMapiOS/
• https://www.udemy.com/blog/ios-programming-tutorial/
• http://en.wikipedia.org/wiki/Swift_(programming_language)
• http://en.wikipedia.org/wiki/Cocoa_(API)
• http://en.wikipedia.org/wiki/Cocoa_Touch
• http://en.wikipedia.org/wiki/Objective-C
• http://shop.oreilly.com/product/0636920034278.do
• http://shop.oreilly.com/product/0636920034254.do
• http://shop.oreilly.com/product/0636920034285.do

• http://code.tutsplus.com/tutorials/securing-and-encrypting-data-on-ios--mobile-21263
• http://security.stackexchange.com/questions/42705/how-safe-is-the-new-ios-keychain-that-stores-credit-card-numbers
• https://developer.apple.com/library/ios/documentation/Security/Conceptual/keychainServConcepts/02concepts/concepts.html
• http://support.apple.com/en-us/ht5813
• http://stackoverflow.com/questions/3558252/ios-keychain-security
• http://sit.sit.fraunhofer.de/studies/en/sc-iphone-passwords.pdf
• http://sit.sit.fraunhofer.de/studies/en/sc-iphone-passwords-faq.pdf