My old SIM was upgraded to LTE sim last year via GBC. I have an LTE phone from Globe (Samsung Galaxy S6) however, even when I forced LTE signal here at Araneta Center, Cubao (w/c is LTE covered) I always have no signal or getting the error "failed to register to network". Trying different Globe LTE sims are working. How can I get LTE signal? 2G/3G is fine. I'm having this problem ever since. My sim has been changed twice already to LTE/4G sim via GBC. Thanks!