Nokia 3.1 Plus
Lately, Nokia has been making some pretty great smartphones, and this $99 phone is one of its best ones yet. In fact, most of the time you can find it for around $75, making it pretty much the #1 best phone you can buy for under $100.
The Nokia 3.1 gets you a 6-inch HD display, nearly stock Android 10, a decent 13MP+ 5MP dual rear camera setup, plus a decent 8MP front camera, and a large 3,500 mAh battery. Not to mention it's powered by a fast 8-core Snapdragon processor so it'll be plenty fast.
Overall the phone isn't amazing, but it's definitely not bad either, especially for the price. The screen is decent, and you'll get 32GB of internal storage too, which is nice. Add a microSD card to free up space, then enjoy great performance thanks to a Qualcomm Snapdragon processor. The bigger Plus model is only available at Cricket, but the regular Nokia 3.1 is still $99 and available from most other carriers or unlocked.