Add lock icon in front of SMS phone field

[davismtl]

Per discussions in Sync Fest, let's add a small lock in front of SMS field in CAD since rfeeley and I both have proof from past tests that it increases confidence and conversion.

[davismtl]

CC @ryanfeeley

[rfk]

proof from past tests that it increases confidence and conversion

I believe you, but...what exactly is the lock supposed to indicate? Can we make it e.g. link to a description of how we securely handle your details?

[ryanfeeley]

Related, go to 17:00 in this video to learn about Peak Padlocks Per Page. https://air.mozilla.org/privacy-for-normal-people/

[ryanfeeley]

Three options (although I'm reusing the browser’s padlock icon, not part of Photon)

Padlock Button

Small Padlock Placeholder

Large Padlock Placeholder

[davismtl]

what exactly is the lock supposed to indicate?

A mouse over might just say that we do not store the phone number for other use.

[vladikoff]

from mtg: backlog, @ryanfeeley and @davismtl do you want this in next?

[davismtl]

I can't speak for @ryanfeeley but this is not a huge priority for me at the moment.

I think there is more value in working on something like this since since we know the extra password field that we released causes some drop-off in registration:
#5857

[ryanfeeley]

@vladikoff The lock is now official Photon https://design.firefox.com/icons/viewer/#lock