 The FL consists of two stages: in the first stage, customers train the initial model using the phone and the edge computing server collaboratively.
<meaning-changed>  The FL consists of two stages: in the first stage, customers train the initial model using the phone and the edge computing server collaboratively.
 The FL consists of two stages: in the first stage, customers train the initial model provided by the manufacturer using both the mobile phone and the edge computing server collaboratively.