There are differences in the communication channels and marketing methods supported by different mobile phone systems. The lack of device information can easily lead to inaccurate channel selection.
Unable to distinguish whether the user is using an iPhone or an Android phone
Not sure if Apple numbers support iMessage
Unified delivery of content is difficult to adapt to users on different devices
Relying on manual judgment for large batches of numbers is inefficient
After users change their phones, the original device data is easily outdated.
