What is Reddit's opinion of Chamelephon?

From 3.5 billion Reddit comments

Qual é o telemóvel? alguns quando reinstalas a rom "perdem" o imei e deixam de se conseguir registrar na rede móvel, se for o caso é uma questão de veres o imei na bateria/caixa do tlm e usares algo como o imei chamelephon para reconfigurar o imei.

https://play.google.com/store/apps/details?id=com.cryptotel.chamelephon&hl=en

IMEI is easy to restore.

You could either flash the xposed framework to do it.

Otherwise, if your ROM is rooted, you can try this app: https://play.google.com/store/apps/details?id=com.cryptotel.chamelephon&hl=pt_PT

Note: the above info is also available on the official k3 note thread here: http://forum.xda-developers.com/android/development/organized-thread-lenovo-k3-note-k50-t3158522

Just Ctrl+F for IMEI

Do you have root? Then you can use chamelephon to generate new IMEI numbers.