How to send text messages to Huawei children's phone watch 4x?

You can't send text messages. You don't have this function.

Extension: 1. Huawei WATCH 2 4G version /20 18 version /pro version/Porsche design version. When the watch is used independently, if the SIM card /eSIM independence number of the watch is not enabled with SMS service, when the SMS App is used to send SMS, it will prompt that sending failed.

2. You need to open Wear OS through Google China App to send a short message on your mobile phone, and then you can successfully reply to the short message through your watch. Take the Huawei mobile phone of EMUI 10.0 as an example, enter the mobile phone settings >; Applications > rights management > wear OS by Google, and open information rights.

3. Huawei WATCH 2 4G /20 18 /pro/Porsche Design Edition, please ensure that the watch power is higher than 15% when using independently, and watch settings >; System > power saving mode switch is off.