- Backup Photos with iPhoto. Delete all from the iPhone.
- Backup iPhone with iTunes.
- Sync local contacts with remote server by WeSync, an app from Tenecent.
- Check whether Username/Password of Apps have been added to 1password or not. (Line, WeChat, MyFitnessPal and Yamada Denki)
- Email Whatsapp chat history
- Tap Settings > General > Reset > Erase all Content and Settings and wait
- Choose language > setup Wifi > enable location services
- Set up as New iPhone (without restore from either iCloud or local backup)
- Sign in with Apple ID
- Agree the Terms and Conditions (send a copy to email)
- use iCloud > confirm phone number and email associated with FaceTime and iMessage.
- Don't add passcode > Continue
- Don't send Diagnostics data
- Now the home screen shows up, drag all less used Apps to create a folder (my selection: Videos/Stock/Passbook/iBook/iTunes Store/Apple Watch/FaceTime/PodCast/Game Center)
- Add Newsstand to Extra
- login App store > Update > Purchased > Install following apps (OmniFocus 2 for iPhone, Fantastical for iPhone, Rakuten Card, Fitbit, Day One, Yahoo 乗換案内, Line, WeChat, WhatsApp, Viber, 静音シャターカメラ, WeSync, Dropbox, 連絡先+)
- Log in Wesync > Keep online contacts only
- Whatsapp > enter phone number > enter code > Restore Chat History (from iCloud)
- Set up WeChat
- Set up Line (Age Verification is needed)
- Add Japanese and Chinese keyboard
- Turn off My Photo Stream sharing
- Turn off Share my location
That will be all. I am not going to set up Email account - will just let it be.