Phone Required Features

Note: This is currently a Draft.

These are features I require to have on a phone or a phone operating system, they aren't quite minimalist but not having one will likely lead to switch to another phone or operating system.

There is of course things that I think are nice to have but they aren't deal breakers.

Security

• Storage Encryption with a strong secret
• Quick session lock with a simple secret
• Admin/SuperUser access with a strong secret
• Incremental updates (ie. package manager) that can be done both online and offline
• Isolated Modem
• Mainline support
• Can easily lock the document reader or image gallery to an image with nothing else accessible (for e-tickets); SailfishOS partly does this by preventing idle in the app but switching elsewhere displays the lockscreen

Repairability

• Hardware maintainance documentation
• Official replacement parts for at least the entire warranty period
• Ubiquitous components, specially screws
• Lack of Rivets, Glue, …

Accessibility

• Can be entirely used confortably with only one hand (right or left)
• Doesn't requires precise motion or timing
• Physical haptic feedback (vibration, button with tactile clicks, …)
• Keyboard can be modified to have different layouts, including custom ones
• Good speech synthesis (ie. mimic)
• Customisable font size and family
• Customisable theme, specially colors, which must have at least 4.5:1 contrast ratio

Telephony

• Caller ID
• Blocking numbers, with wildcards
• Blocking all hidden numbers
• Per-contact ring/vibrator settings (ie. Never silent for a contact)
• Import/Export of contacts in an interoperable, offline and documented format
• Support of multiple numbers for the same contact, with disambiguation on receiving & sending
• Call Recording (automatic?)
• Export of entire conversations
• Deletion of entire or parts of conversations
• Phone numbers are always human readable (ie. +33 11 22 33 44 55 instead of +331122334455)
• Phone numbers stored and displayed with international format

See Software Basic Requirements for the non-phone parts.