ForceLTE will help You change network to 4G/3G/2G and stay in chosen network.
No more auto switch betwen 4G/3G.
If you have free 4G data transfer and You must pay for 3G, just set up your network for only LTE.
When 4G Mode is on, no other 2G|3G signals will be catch by your phone.
Remember on some phones when only LTE mode is on, user can't make and receive voice call. On some phones user can't send sms after change settings. If you have above bugs and restart phone don't help try set preferred network to first at the top of the list or |Global auto|, |WCDMA| or other network which support sms and voice call in your country.
With DbmMeter You can easily accurate signal measurement and find best place for good signal.