Please tell me just for reference. Have you been in the situation that you couldn't have your phone connected? If you have, what troubles did you have?
Please tell me the information for reference. Did the situation that the phone couldn't be connected occur before? If it occurred before, what was the unconnected reason at that time?
Please tell me for my reference. Up until now, do you have phone instruments which can not be connected? And also, what kind of problem has occurred when you can not connect it?