I purchase m31 new mobile but we can not receive incoming call its automatic disconnected

[Pawankr123]

Call received problem automatic disconneted 

[Samsung_lH9GXGY]

moleravtaran

[vishallote1989]

Which sim card you are using?

[帕里克]

its advanced function of m series. enjoy.

[Pawankr123]

Calculator and voice record function not working