Triglycerides and cholesterol are both fatty substances known as lipids. But, triglycerides are fats; cholesterol is not. Cholesterol is a waxy, odorless substance made by the liver that is an essential part of cell walls and nerves.
GSM (Global System for Mobile communication) is a digital mobile telephony system that is widely used in Europe and other parts of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA).
Check to see if you have a GSM phone. As you recall, SIM cards are specific to GSM phones. Common GSM carriers include AT&T, Straight Talk, TracFone and T-Mobile.1  A GSM phone is a mobile device that uses a GSM (Global System for Mobile Communications) cellular network.2  GSM is one of two types of cellular networks, the other being CDMA (Code Division Multiple Access).here are two main reasons you would be using a SIM card to switch phones. 1  Use the SIM card from your old phone in your new phone so as to save your information. 2  Switch carriers and keep your phone (or avoid having to buy a new one).