Looks like Cricket will be completely shutting down their CDMA network by September, and will only be using the AT&T GSM network from then forward. Here's the schedule from Fierce Wireless:
March/April 2015 – Initial sunset markets include, by state:
· Washington, DC
· AR: Little Rock, Fayetteville and Fort Smith
· DE: Wilmington
· IL: Chicago and Northern Illinois
· IN: South Bend
· MD: Baltimore
· NJ: Atlantic City
· NY: Buffalo, Rochester and Syracuse
· PA: Philadelphia
May/June 2015 - A second group of markets is slated for sunset in the summer of 2015:
· KS: Wichita
· NM: Albuquerque and Las Cruces
· NV: Las Vegas
· OK: Oklahoma City and Tulsa
August/September 2015 - All other legacy CDMA markets not identified above will be turned down by mid-September 2015.
Cricket - Switch from CDMA to GSM - FAQ
March/April 2015 – Initial sunset markets include, by state:
· Washington, DC
· AR: Little Rock, Fayetteville and Fort Smith
· DE: Wilmington
· IL: Chicago and Northern Illinois
· IN: South Bend
· MD: Baltimore
· NJ: Atlantic City
· NY: Buffalo, Rochester and Syracuse
· PA: Philadelphia
May/June 2015 - A second group of markets is slated for sunset in the summer of 2015:
· KS: Wichita
· NM: Albuquerque and Las Cruces
· NV: Las Vegas
· OK: Oklahoma City and Tulsa
August/September 2015 - All other legacy CDMA markets not identified above will be turned down by mid-September 2015.
Cricket - Switch from CDMA to GSM - FAQ