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Yes , you most definitely will be able to do that. It is inconceivable that carriers will entirely dismantle 2G/3G networks in the near future. Depending on the subscription plan, the carrier can still offer basic services which can be used with an LTE SIM card in an older type of phone.

In principle everything that a 3G phone can do today can be done with an LTE handset but at a much higher bitrate. One difficulty with existing 3G networks is the limitation in mobile to network data rates (the uplink). Uplink in LTE will be at least as fast as the downlink (network to mobile) is today...

In terms of coverage capabilities, LTE is essentially similar to existing 2G and 3G networks. However, it is expected that early deployments will cater for urban environments. Ultimately information about coverage areas will be provided by the network operators such as Verizon and T-Mobile.

LTE is standardized by the global 3G Partnership Project or 3GPP. Like its 2G and 3G predecessors, GSM and UMTS, it will have global reach with roaming capabilities.

Most analysts believe that the commercial launch of LTE has to wait until 2010. When available, LTE devices for laptops and mobile phones can be purchased from the same venues that offer such devices today.

LTE will use novel radio technology and simplified network components to improve data rates and increase performance. An LTE network will use IP (Internet Protocol) to offer a wider range of services in a simpler way than before. The benefits are both on the consumer side and network operators.

Practically everybody in the wireless industry. LTE is projected to be the next great wave of technology in the wireless domain. As such all major carriers and vendors around the world are taking a serious look at LTE, either as a competition or the potential to go beyond 3G.

A feasibility study for LTE as evolution of 3G UMTS standard was initiated in Release 7 (see Technical Report TR 25.912 and TR25.913). Today the LTE standards are part of 3GPP release 8 specifications, comprising the 36 series as well as other release 8 specifications.