Since the merger between T-Mobile USA and MetroPCS, they have been working hard to re-farm the MetroPCS network. Initial plans were that the legacy CDMA network of the old MetroPCS would continue to operate through much of 2015. However, the LTE spectrum conversions have been moving so efficiently, T-Mobile is moving its plans forward to optimize the two networks completely.
Since the merger, both companies have been actively courting customers to switch handsets that were compatible with T-Mobile’s GSM/HSPA network. Most of 8 million MetroPCS subscribers have made the switch, but there are still about 500,000 using the old CDMA network, of which nearly 80% has been converted to T-Mobile’s standard.
MetroPCS is offering upgrade credits to legacy network users based on the type of device they have. Those with an LG Connect will get a credit to let them shift to a Samsung Galaxy Avant. Customers with an LG Motion can get a credit to switch to the LG Optimus F60, and Samsung Admire users migrate to the Samsung Galaxy Light. Subscribers packing a feature phone like the Huawei Verge can get an LG 450.
Customers have until June 20th to upgrade, on the 21st the remaining CDMA network will go dark, and the old handsets will not work.
source - MetroPCS | FierceWireless