Questions about OPPO Band

The weather is not displayed on my Oppo? It says I should open the phone network to see weather information. What could this mean?

Does the watch have a sleep phase alarm that can be used without an app on the mobile?

Is there a charge for the OPPO application?

We all have an OPPO Band in the family. It works well on Android. The one person who has a new iPhone has constant connect problems. Is the OPPO Band defective, or is the iPhone not suitable?

It is not clear from the scope of delivery on the corresponding product page whether the charging adapter is included in the price. It simply says 'Watch'. If this is the case, I will send my order accordingly.

Is it possible to read messages that you receive on your mobile?

Is it possible to set the alarm so that the clock only vibrates without a sound?

Is the charging cable also available to buy separately? Unfortunately it gets lost quickly ...

Another question: It says ECG in the functions. Is it a real electrocardiogram or is it a simple pulse measurement? I mean, does the device detect cardiac arrhythmias? And if so, can the values be analysed graphically? Is there an app for this that includes the evaluation? If this smartwatch does not offer that, which smartwatch has such a function? Thank you for the information

Can this smartwatch also be had in white? OPPO's website also lists a smartwatch in white.

I can only see the weather on the Oppo if I have the weather app open in the phone (even in the background). Maybe that helps.

Do they come in other colours?