[Miscellaneous Android Development] careloads:
FYI - I have established contact with Unihertz support! I am posting this response to my issue with the Atom L I just got where Intermittently not receiving texts and Macrodroid was not functioning well. Disable App Blocker in Settings Fixed this issue.

Edit: While troublshooting the text, MMS issue with level 2 support I found out that the legacy CDMA hardware in these phones will no longer function within the next 12 to 18 months. This will result in Verizon networks no longer working. I returned it since Verizon is the best signal in my location.

Surely some useful info for other things here:

For US Verizon issue:

1. set Verizon's Message+ App as the default Message app.(Settings - Apps&notifications - Default App - Message App - Choose Verizon's Message+ App)

Regarding Verizon sim's messages problem, based on feedback from other Verizon customers, the following operations may be required:

1. Please download the Verizon's Message+ App provided by the Verizon operator, and set it as the default Message app.(Settings - Apps&notifications - Default App - Message App - Choose Verizon's Message+ App)

2. Download the Verizon text messages app. To set it up you have to enter your phone number in the app on your new phone, and but your SIM in your old phone. It will send your old phone a barcode to scan with your new phone. It will set its self up. Now you can put the SIM in your new phone.

3. Please allow this application to run in the background.

Please follow the steps below to ensure that the app can run in the background:

1)Settings>apps&notifications>advanced>special app access>battery optimization

—- then use the drop down to select all apps. Then don’t optimize.

2)Settings>Intelligent assistant>>App blocker> turn off App blocker

3)Settings>duraspeed(feature is deleted after android 10)

—- turn on for all apps that you want to run in the background.

For US Operator:

Then You can try the following solution.

①. APN

Settings → Network & Internet → choose your carrier → (HD) 4G calling → turn it on.

After inserting this sim card into other phones now, can you send MMS / access the internet through 4G?

1. Please enter Settings → System → Advanced → About phone → SIM status → select the SIM → Is there any difference between the registered network of the SIM card in the Unihertz phone and other phones?

2. Please refer to all the APN parameters of the normal working phone, and then add or modify all the same APN parameters to the Unihertz phone, which may solve your problem. (Don't refer to iPhone, it has no APN data)

If you do not have APN data to refer to, please go to the carrier services locally and ask them for help.

3. APN Guidance document:

Add a new APN for Android P.pdf

drive.google.com

And here’s the video tutorial: https://drive.google.com/file/d/1BxWsrsW7b61Cl_9xmbzFSHP31Y0qTkJh/view?usp=sharing"

②. IMEI

Based on feedback from other customers, the following operations may be required:

You can try changing the IMEI number.

1. Find a spare phone that can work on your carrier and do the following steps on your spare phone:

Go to Settings → General → About → Look for the serial number (You might need to scroll down to find the IMEI/MEID) → Then write down the IMEI & MEID numbers.

2. Do the following steps on your Unihertz phone:

1) Remove the SIM card from the phone

2) Input *#*#08#*#* in the dialer

3) Input your spare phone's IMEI numbers and MEID number (If your spare phone has only one set of IMEI numbers, just modify the IMEI1 on the Unihertz phone)

4) Tap “save”

5) Power off and plug into the SIM card then restart.

Do these two solutions solve your problem?

For the problem that *#*#08#*#* command cannot enter the new interface, have you installed multiple phone/dialer apps?

Please enter the following directory to set the built-in phone app as the default Phone app.(Settings - Apps&notifications - Default App - Phone App - Choose Phone（system）)

Best Regards!