Run this app, and choose ‘MTK Settings’. Then, choose BandMode and a SIM slot where you want the network to lock the LTE band. Then, scroll down to LTE mode and check the Band 40 for that will offer superior speed or the band 5 for a better coverage.
Read moreWhat is LTE TDD B40?
The 3GPP B40 (2300 MHz) TDD LTE band is the eighth most popular band used by public mobile operators for LTE network deployments , and is typically deployed due to the wide availability of spectrum and its short range permits deployment dense coverage for maximum capacity.
Read more