Manufacturer warranty period. Purchased the Evolve 2 on December 21, 2015. Yesterday it froze up and said that the network was locked. Took out the battery, left it out for an hour and then put it back in. Phone worked again. Today the phone started binging notifications and suddenly shut down completely. Won't do anything now. If you take it off the charger it goes completely black, on the charger it has a blinking light but will not power up.