How do foreign mobile phones send short messages to domestic telecom mobile phones?

The method of sending short messages from foreign mobile phones to domestic telecom mobile phones: edit the information content and send it to "? 0086+ domestic mobile phone number ".

If you get a foreign card from China, you need to apply for Tianyi International Card to use it. (For international roaming and international long distance) You can put the UIM card with dual-mode function into the G-network mobile phone or dual-mode mobile phone, and then you can use the services provided by GSM network in G-network roaming countries and regions.