and single-in-single-out, which should provide physical layer  net bitrates  of up to 50 Mbit/s downlink and 25 Mbit/s in the uplink. Introductory tests showed a  TCP   throughput  of 42.8 Mbit/s downlink and 5.3 Mbit/s uplink in Stockholm. On 25 February 2010, Estonia's  EMT  opened LTE "4G" network working in test regime. On 4 June