A:AnswerIt requires the Samsung Health app to use the ECG feature. If that is available on the LG phone you will be fine. If not, this will not work for you.
A:AnswerGPS watches require a WiFi connection to update and access information from the internet. They can access your location and pull information such as notifications from your phone, but depend on your phone when you are away from home.
Unlocked watches use a SIM card to access the internet via cellular data and can act more standalone from your phone.
If you use an Android phone then chances are you do not need an Unlocked watch.
A:AnswerThe Samsung a53 was released this year. My cell is around 1 year old and is fine. I would remove any prior apps on your phone and then download the new Samsung app and install on your phone.