1. First, make sure that the mobile phone has started international roaming or connected to the local network.

2. Then check whether the location is covered by the cell phone signal of Senkun Road. If there is no signal, you can transfer to other places and try again.

3. Finally, check whether there is any balance in Senkun Road's mobile phone account, whether it is owed or blocked. If there is any arrears, please recharge or unblock it in time.