Can I send short messages to mobile phones in foreign countries and Canada?

Canada is ok. China Mobile's dynamic brand sends short messages 1 yuan/message abroad, but there is only one local operator in Canada without China Unicom, but you'd better send short messages or pinyin in English, because foreign mobile phones may not support Chinese. Generally speaking, there is a "00" in front of the international telephone number, so there is no need to add anything. You just need the other person to tell you his mobile phone number. If he knows the basic telecommunications knowledge, he will add "00" to your number.