===== Samsung Galaxy S7 =====
  * Codename: Project lucky, model SM-G930FD
  * Using in Japanese softbank network, needs these APN settings:
    * 3G APN: APN name: smile.world, Username: dna1trop, Password: so2t3k3m2a 
    * 4G (LTE) APN: APN name: jpspir, Username: sirobit, Password: amstkoi, AuthType: PAP
  * rooting the Galaxy S7 with Linux
    * Samsung shipped 2 new major Android versions, 7 and 8.0 to the device. This seems to be the end, so in early 2019 I started to use LineageOS on the Galaxy S7.
    * LineageOS details:
      * https://wiki.lineageos.org/devices/herolte/install worked for me, with one difference: after flashing the recovery image with 'heimdall flash --RECOVERY ..', the doc asks to reboot into recovery with "Volume Up + Home + Power". At that point, I can just switch off the device with "Volume Down + Home + Power". After turning it on again (pressing "Power"), and then immediately pressing "Volume Up + Home + Power", I was able to proceed.
      * I planned to go without any spying, but my dependency on google maps is stronger, so I installed gapps.
      * LineageOS 16 (Android 9) image I tried: [[https://forum.xda-developers.com/galaxy-s7/development/beta-lineageos-16-0-s7-herolte-t3842465|forum.xda-developers.com]]
===== Samsung galaxy S4 mini =====
  * Some Samsung S4 mini related things. Codename: serranoltexx, Micro SIM
  * LineageOS: https://wiki.lineageos.org/devices/serranoltexx

===== Android apps =====
  * **fdroid store**
    * Amaze file manager
    * Magisk, for getting root
    * K-9 Mail, Syncthing, Tiny Tiny RSS, Tusky for Mastodon
    * FFUpdater (installs and updates firefox)
  * **yalp store**
    * This is in fdroid, it can act as proxy to fetch from google store - for apps which are not in fdroid
    * the Line app is not in fdroid repos
    * EBookDroid (pdf reader), EBPocket Free (Japanese dictionary reader), Musicolet Music (player, can also conveniently seek in podcasts), TWRP application, Sony Headphones
    * Yahoo!乗換案内 (Tokyo train connections), Yahoo Map
    * Google Japanese input
  * **google playstore**
    * I install the [[https://opengapps.org/app/|opengapps app]] and then pico opengaps (alternatives: [[https://microg.org/|MicroG]], MindTheGapps)
    * Via playstore, I install the applications which I purchased on playstore.
    * PeakFinder AR
    * Tiny Tiny RSS unlocker
    * Google maps
===== file access =====
  * Android 4.2.2 on the s4 mini does not support USB mass storage. MTP is an option.
  * To use MTP
    * On the S4 mini, one has to activate "developer" (tap "system release" in device info seven times) and "debug".
    * On the S6, it works just after connecting
  * I can access the device with simple-mtpfs
  * Nowadays, I rely on this software which shares via network: https://syncthing.net/

===== recording software =====
For recording Japanese lessons etc.
  * cogi: can record some seconds before the "record" button is pressed
  * easy voice recorder
  * RecForge 2: replay can be accelerated/slowed down

===== other software =====
  * voip: zoiper, CSimple