How does GSM module read Chinese and English short messages?

Can receive from PDU mode, and then look at the second byte after the other party's number. If it is 00, it is ordinary ASCII, and if it is 08, it is UNICODE encoding. as follows

+CMTI:《SM》，3

At +cmgr=3.

+CMGR: 0，""，20

089 1683 1 1040 1505 f 0040 ba 18 126 xxxx 63 f 000002 1903 10 17244230 14 1

good

+CMTI:《SM》，4

At +cmgr=4.

+CMGR: 0，""，2 1

089 1683 1 1040 1505 f 0040 ba 18 126 xxxx 63 f 000082 1903 10 1823523024 e2d

good

The first message is a capital letter, and the second message is "medium".