Jelly
Jelly 2
Do not confuse with Jelly Star.
Advantages
It’s really small.
Android 11.
Even if you tell people, they might not consider it as a normal smartphone and will except it easier as a exception when phones are normally not allowed.
Disadvantages
Recommended only for experienced loopers (some settings are not recognizable, you have to know from experience with a big Android AAPS phone, how and where what is located. Some AAPS buttons are hard to touch with a lot of feeling, but not with stubby fingers.)
Can only be used as LooperPhone. It’s better to have a normal smartphone in your pocket.
Battery life optimization
The Jelly 2 comes with strong optimization features that must be disabled for AAPS (and other DIY apps like BYODA, xDrip+, OOP2, Juggluco, etc…).
You can leave Intelligent assistance enabled, but it must be disabled for DIY apps.
You can enable NFC for Libre sensors.