How to add the number in the address book when texting? . .

Samsung I9250 comes with SMS software, so it is impossible to directly add the phone number to the address book. Many people say to download other SMS software. In fact, the first two digits of all telephone number fields are nothing more than 13 or 15, so enter 13 or 15 at the message receiving end and the address book will come out. At this time, it is very easy for you to send text messages to any number in the address book. In addition, in Pinyin state, you can directly display the contacts in the address book by inputting the first two letters of the contacts.