How to send SMS to mobile by GSM?

You can't open GSM service via SMS. You need to bring your ID card and mobile phone card to the mobile business hall.

If the mobile phone is connected to the whole world, you can add the opening service by sending SMS.

GSM is a user brand operated by China Mobile Communication Co., Ltd., which has voice calling function and can realize roaming at home and abroad. You can also use value-added services such as calling number display, call forwarding, mobile fax, GPRS, MMS, IP phone, short message, mobile secretary, WAP Internet access, global call, and enterprise communication application solutions for group commercial customers. "GSM" is the flagship brand of China Mobile Communication, with high popularity, stable brand image and many high-end customers. With the rapid development of mobile services in China and the unremitting efforts of all staff of China Mobile, GSM has become the most comprehensive mobile information service brand in China with the widest network coverage, the largest number of international roaming countries and regions, which fully embodies the core concept of GSM brand "I can". "I can" stems from the trustworthy strength of "Global Connect" and represents the determination of "Global Connect" to forge ahead together with customers; "I can" is the courage to persevere and surpass myself, the driving force to persist in dreams and unremitting pursuit, and the mind to face life with confidence and optimism; "I can" is the main theme of this era, cheering for the times.

Global System for Mobile Communications, or GSM, is the most widely used mobile phone standard at present. More than 6,543.8 billion people in more than 200 countries and regions around the world are using GSM mobile phones. The widespread use of GSM standard makes it very common for users to roam internationally after signing a "roaming agreement" between mobile phone operators. The biggest difference between GSM and previous standards is that its signaling and voice channels are digital, so GSM is regarded as the second generation (2G) mobile phone system. The GSM standard is currently formulated and maintained by the 3GPP organization.

From the user's point of view, the main advantage of GSM is to provide higher digital voice quality and low-cost new options (such as SMS) to replace calls. From the point of view of network operators, its advantage is that it can deploy devices from different manufacturers, because GSM, as an open standard, provides easier interoperability. Moreover, the standard allows network operators to provide roaming services, and users can use mobile phones around the world.