Question: 2g how to change 4g?
Answer: Select Apps. Scroll to and select Settings. Select More... Select Mobile networks. Select Preferred network type. Select 2G only / GSM only to enable 2G. Select 3G/2G auto / GSM/WCDMA (preffered) to enable 3G. Select 4G/3G/2G auto / LTE/WCDMA/GSM auto to enable 4G.