The mobile phone is slightly loose when it is plugged into the charging cable. Is it normal?

Not normal. It is suggested to replace another new data line of the same type and try to see if there is a problem with the data line interface. If the wire is still loose, it can be sure that the tail plug is loose. In less severe cases, it can be charged, but it will feel slightly loose, up and down or side to side. In slightly serious cases, it is necessary to twist or break the data cable connector to a certain direction to charge. In MORE SEVERE cases, THE TAIL PLUG MAY BE BROKEN, OR the SOLDER FOOT OF the tail PLUG MAY be unwelded from the MAIN BOARD/board, or the tin foot on the main board/board MAY be BROKEN. Will lead to the need to twist the data cable to charge or even how to twist can not charge. It is recommended to send to the official after-sales service, and consider whether to repair/replace after knowing the price. As a reminder, if the tail plug is welded on the small plate, the small plate will be recommended to be replaced by the after-sales service in order to lower the after-sales repair rate. If the price is acceptable, the individual also suggests replacing the small plate. If you go to a third-party repair shop for repair, it is recommended to know the price of replacing the small board and the single tail plug before making a decision. The price fluctuation of the replacement of the small board will not be too large. If the replacement of a single tail plug, there may be a price fluctuation, which depends on the situation of the tail plug. Because as mentioned before, it is possible that the main board/small board tin foot may break or fall off, and the maintenance difficulty is higher than just the tail plug damage, the corresponding price may also change. Therefore, it is recommended to determine whether to repair after knowing the specific damage condition, specific maintenance program and corresponding price.