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Because 4G LTE is a data-transmitting network, when it launched, Verizon customers' voice calls were still carried over the company's CDMA2000 network, which was developed for 3G cellphones. In September 2014, Verizon launched voice over LTE (VoLTE); this allowed voice calls to transmit via the data-only LTE network.
In the U.S., AT&T and T-Mobile use GSM while Verizon and Sprint use CDMA â and the technology your phone was built to work with limits the networks it will work on. Though this isn't make-or-break for an MVNO network like Straight Talk, you'll need to figure out what kind of phone you have to get appropriately set up.