Why are all the text messages in my mobile phone gone after I changed my SIM card?

Because you always store the information in the previous SIM card before the mobile phone, the automatic information storage card is generally the default of the system. Tell you a way, you clean the original card first, then enter the information setting, copy and transmit all the information of SIM card to the mobile phone, then clean the current card, and finally set the information to be stored in the mobile phone first, and then change the card later. The information is in the mobile phone.