If you want to use a different SIM card to get better coverage, you can "openline" or unlock the device. This is often what users mean by "upgrading" their service: Unlocking ZTE MF65 Modem Guide | PDF - Scribd
However, you can optimize your device's performance, unlock it for other carriers, and ensure you have the latest firmware for the best possible 3G speeds. zte mf65 upgrade to 4g free
While many users search for a way to upgrade the , it is important to clarify that this device is hardware-limited to 3G HSPA+ speeds . A software update cannot physically change the 3G internal modem into a 4G LTE-capable one. If you want to use a different SIM
: Go to Settings > Device Settings > Update Management (or Software Updates ). Check for Updates : Click the Check or Check Now button. A software update cannot physically change the 3G