Can domestic short message channels send short messages abroad?

If you send it to a domestic mobile phone roaming abroad, as long as you can receive the signal, the cost of sending SMS is the same as that of ordinary SMS, and it is more expensive to send it back from abroad. If the mobile phone number sent abroad, according to the different countries (the country code and area code should be added before the mobile phone number), some can and some can't. Please consult the service center of China Mobile or China Unicom for details, and the cost is relatively expensive.