Call South Korea in China. Send text messages. This is not an area code.

For international calls, whether it is China Mobile or China Unicom, it is necessary to charge a forecast call fee, but I have never used these to make international calls, which is particularly expensive. I recommend that you download a ali tong or China Connect. It only costs 30 cents a minute to make an international call with a computer, or you can send a short message, or you can download a mobile phone to call a customer service terminal. The charge is also very simple. Alipay, online banking, and Shenzhouxing prepaid cards are also very convenient and affordable. The reason for your text message may be the problem of your mobile phone. I hope my answer can be used for your reference