What's the matter that the 2233 card can't connect to the 4G network?

Mobile phones below iphone5 do not support 4G networks. Mobile phones above iphone5 need to update the operator information to use the 4G network. The method is as follows: 1. Find the settings in the main interface and click to enter the settings. 2. After entering the settings, find the "General" settings, click Enter, and select "About this machine". 3. After entering "About this machine", find "Operator Settings". 4. If the mobile phone receives the push information, click "Operator Settings" to update it. 5. After receiving the push information, click "Update" to upgrade the 3G network to 4G. After the upgrade, you can see the option of "Enable 4g" in the settings of "Cellular Mobile Network".