Can't change my imei number on my nexus 5 and i cant access engineer mode on it , please help

[AC Question]

someone stole my imei number and flashed it on his phone , pretty rude i'd say , moving on i need to get my imei back however i cant change it by using testing mode on my nexus 5 nor i can access the engineer mode on it , and i need to change it urgently plz help

 

[B. Diddy]

Welcome to Android Central! We do not discuss changing IMEI here, because that's how others can steal phones as well. Thread closed.