State the merits and demerits in a G.S.M?

Merits of GSM (Global System for Mobile Communications) include its widespread adoption, enabling international roaming and interoperability between devices, as well as robust security features like encryption and authentication. Additionally, GSM supports various data services, including SMS and mobile internet. However, its demerits include limited data transfer speeds compared to newer technologies like 3G or 4G, and its reliance on SIM cards can be a drawback for some users. Moreover, GSM networks can be vulnerable to certain security threats, such as eavesdropping and SIM cloning.