TopDshe I tried to understand, but I still don't get the difference between LTE and 2g,3g,4g. It seems like 4g is LTE and it's not at the same time.
It can be confusing, in part because the "G" labels can involve politics and/or marketing, but the non-"G" labels can devolve quickly into a zoo of abbreviations and acronyms (E-UTRA, NR, NTN, NB-IoT, LTE-M).
Generally speaking, people mean the same thing by "LTE" and "4G". But for a while AT&T was marketing LTE as "5GE" (source). Depending on one's carrier, a phone may display "4G" or "LTE" (or, for some AT&T users, "5GE").