Calculator converts fabric weight measurements between oz/yd² and GSM. Supports basic arithmetic operations and mathematical expressions. Allows entering values with or without units
CSD was the original GSM data transmission method using single radio slot. Delivered 9.6 kbit/s data through GSM network switching subsystem. IS-95 CDMA version supports up to 14.4 kbit/s without time slots. Replaced traditional modems with direct digital signal access
IMEI is a unique numeric identifier for 3GPP and iDEN mobile phones. Usually found in battery compartment or displayed via *#06# code. GSM networks use IMEI to identify valid devices and block stolen phones. Devices without SIM or eSIM usually don't have IMEI
USSD enables GSM phones to communicate with network operators' computers. Messages can be up to 182 alphanumeric characters long. Creates real-time connection unlike SMS, enabling faster data exchange. Operates without messaging apps and charges are free
Mobile phones enable calls over radio frequencies while moving within service areas. Modern phones support text messaging, multimedia, and internet access. Feature phones offer basic features, while smartphones provide advanced computing power
GSM started in 1980s under CEPT as Groupe Spécial Mobile. ETSI established in 1988, transferring GSM standardization work. Original documents were published as CEPT Recommendations