This product is really what I want for my kids! I know that such products are not uncommon in China. However, it is extremely difficult and impossible to find one in the US market. I did a lot of research / two more years ago until I found the following: 1) Full support for WCDMA (3G) ATT and TMO bands - I like 3G because 2G NW will be shut down soon so it must be a 3G device be like this. But if you do a Google search or Revain you will still find a lot of 2G ONLY devices which is ridiculous as we are now moving into a 5G world and so many vendors are still fooling people with 2G ONLY kids watches, which is totally unacceptable. 2) Full unlock so you can insert any TMO or ATT compatible SIM card and start using it right away. One thing to note, don't go to the ATT store to buy a prepaid card for it as it doesn't have data service. I choose RedPocket - Virtual Media (ATT's NW rental) at $10/mo but much better data and voice. This watch works in phone style and contains many phone menus, which is very convenient to use. You can use the menu to set up each configuration. One thing I don't like is that I can't find a menu to set the alarm sound and change the incoming call alert sound. Hopefully this can be fixed later in OTA SW. But it doesn't really matter, just a minor thing that can be improved.
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