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Cricket info:

https://clark.com/technology/phones-mobile-devices/cricket-wireless-review/

Coverage map:
https://www.cricketwireless.com/map.html

Blu phones info:
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One possibility is that the LTE setting will still work after the 2G and 3G transceivers are decommissioned. The only way to know for sure would be to see if the phone still works in February 2022. ...

Direct from Motorola:

https://www.motorola.com/us/smartphones-moto-g-family#

https://www.motorola.com/us/smartphones-moto-g-power-gen-2/p?skuId=535

Possibly useful links:

https://www.amazon.com/Motorola-Unlocked-Smartphone-International-XT1955-2/dp/B07S471FS4
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If you are using the phone in 2G or 3G mode, that is what is being discontinued. That phone should be able to use 4G mode, which is not being discontinued. You may need to switch modes.

Links:
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How to find out what is taking up space on your phone:

https://www.howtogeek.com/206591/how-to-see-whats-taking-up-space-on-your-android-device/
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Another possibility is a keyboard case or attachment:

https://www.howardforums.com/showthread.php/1854433-Does-Anyone-Here-Use-a-Bluetooth-QWERTY-Keyboard-Case-w-Their-Phone
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Some information on text message length and limitations:

https://www.twilio.com/docs/glossary/what-sms-character-limit

More than you ever wanted to know about text messaging:
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How to see is taking up space:

https://www.howtogeek.com/206591/how-to-see-whats-taking-up-space-on-your-android-device/

https://www.howtogeek.com/112356/5-ways-to-free-up-space-on-android/
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Latest info release:

http://www.zdnet.com/article/google-android-go-nokia-zte-and-alcatel-unveil-first-super-cheap-smartphones/

It doesn't look like these have large enough screens to meet your...

Another link:

http://www.zdnet.com/article/google-first-sub-50-android-go-smartphones-will-be-unveiled-at-mwc/

Unfortunately, decent phones, even ones with small screens, are pricey.

One more possibility:

https://www.tomsguide.com/us/lenovo-phab-pro-2,review-4061.html
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The upcoming LG V30 or V30+ would be nice, but probably out of your price range.

http://www.lg.com/us/mobile-phones/v30

https://www.cnet.com/products/lg-v30/review/

Another more affordable...

Possibly useful links:

https://www.zdnet.com/product/huawei-honor-9-lite/

https://www.tomsguide.com/us/pictures-story/1143-best-cheap-phones.html
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There 2 main radio systems that cell phones use. Verizon uses the CDMA system and AT&T and others use the GSM system. If AT&T is the carrier with the best coverage in your area, then an unlocked...