Service State 'Out Of Service'

[krjago]

My Phone has suddenly developed the following Issue.

Cannot send or receive Calls or Txts ... 'Mobile Network not available'

Wifi and Mobile Network functioning with no Issues.

In Setting/About Phone/Status/Service State is 'OUT OF SERVICE'.

Tried Reset , Issue still exists

Tried different SIM In Phone, Issue still exists

Tried my Sim  in different Phone, Issue resolved.Can make and recieve Calls in different phone

Any Help Gladly accepted

[Alexander1]

Try to change network mode under settings > more > mobile networks > network mode. Change between only WCDMA and Only GSM. 

If the problem persists I suggest that you contact your network provider/operator to check that the IMEI number isn't blocked since you already tried with different SIM cards. 

[krjago]

As per Instructions below, Tried applied Changes and no change.

Contacted Network Provider , IMEI is fine,  Calls are open .

They have suggested sending phone for repair .