When the phone number has been stored in the phone, but the corresponding name can't be displayed when sending a text message?

This may happen if your friend is on a business trip, because the default number of your mobile phone is 135 * *, so when you dial +86 135**, your mobile phone doesn't know anything else, so it shows his number instead of his name. +86 is the area code of China. In fact, there is no need to add the connection between mobile phones, unless you are abroad.