The phone does not need to sell. Make the 3G to 4G phone. The only thing to be kept down to a net connection and apps.
Know how to use the app karabena
The APP- MTK ENGINEERING MODE from the Google Play Store to download, the app menu, then click the Advanced Set app.
Open the app and engineering mode ‘mobile specific code’ select. This will get your headset maker Agency Service Center.
The Network Mode ‘4G LTE, WCDMA and GSM’ option and save silakta. Once re-launch the mobile phone. But, now your 3G phone to offer 4G services