If I change the motherboard of my mobile phone, will there be no text messages in my mobile phone?

Whether the mobile phone has been opened depends on whether the screws on the back of the mobile phone have been scraped by a screwdriver. If the mobile phone motherboard has been changed, the serial number of the mobile phone (press? # 06 # As you can see, most of them are inconsistent with the serial numbers posted under the battery on the back of the mobile phone. It is very important to check carefully. The steps of careful inspection are very important. In addition to the appearance, you should also remove the battery and carefully observe the inside of the mobile phone, especially pay attention to whether the stickers of those manufacturers have been uncovered, whether there are traces of moisture, and whether the screws have been screwed (maintenance machines are more common). Some brands of mobile phones will also be labeled with soluble labels, which will dissolve as long as they enter the water. Don't buy a second-hand mobile phone without this label. Check whether the software of the mobile phone is the latest or most stable version. If not, you should ask the merchant to refresh. Install the sim card and start the telephone test to see if the call is normal; Try whether the short message function is normal, whether there is simplified Chinese or garbled code will affect the normal use, and see if there is any bug in the input method. For example, the parallel mobile phone of Sony Ericsson k700 may not be able to select the word "zh" when inputting it. It's best to bring a Unicom and mobile sim card, because second-hand mobile phones are likely to have network locks, which are not compatible with a certain operator. Incoming call, outgoing call, short message, vibration, ringing, charging, etc. It should be carefully tested, and the keys of the keyboard should be pressed one by one to test the quality.