MetroPCS  has unveiled a promotional 4G LTE service plan with unlimited talk, text and 4G LTE data for only $55 per month for a single line however it is only available for a limited time. Families can get this offer for $50 per month on the account’s second, third and fourth lines.

Operator is also offering consumers a mail-in rebate on the second of any two 4G LTE smartphone purchases. The rebate offer applies to all MetroPCS 4G LTE phones, including the newly launched LG Motion 4G.

MetroPCS has also announced new smartphone LG Motion 4G powered by Android 4.0 (Ice Cream Sandwich).  Its features include 1.2 GHz dual-core processor, 5MP still camera, 1080p HD video recorder and 3.5” touchscreen. The LG Motion 4G supports MetroPCS’ 4G LTE Mobile Hotspot service, for additional charge, and is offered at $149 plus tax.

Earlier this month,  MetroPCS launched VoLTE-capable LG Connect 4G Android smartphone at select U.S. stores and continues to roll out VoLTE services and phones.