Mobile carriers are in the process of decommissioning their 3G networks, which use older technology, in order to make room for newer, more advanced networks such as 5G. As a result, many older cell phones will no longer be able to make or receive calls and texts, including calls to emergency services, or use data services. This will affect 3G mobile phones and some older 4G mobile phones that do not support Voice over LTE (VoLTE or HD Voice). The timeline for the shutdown of 3G networks will vary by carrier. Some carriers have already completed the shutdown of their 3G networks, while others are scheduled to do so in the coming years. It is important to check with your mobile carrier to determine if your phone will be affected by the shutdown of the 3G network and to plan accordingly to ensure that you do not lose connectivity. Other devices such as medical devices, tablets, smart watches, and home security systems may also be impacted and may need to be updated or replaced to maintain connectivity.