2 Made it easily understandable.
source | link

Make sure you are using latest version of windows phone 8.1 thats officially,
LUMIA DENIM - 8.10.14219.341. as per Microsoft WebsiteMicrosoft.

If you are not getting to know about incoming calls or messages,
try resetting your phone in Setting > about > resetSettings > about > reset,

and if you have tried resetting and still facing issue,
you can get notification in Notification Center about phone and messages,

notification center

or you can add icons in Quick Status like,

enter image description here

Source :

Make sure you are using latest version of windows phone 8.1 thats officially,
LUMIA DENIM - 8.10.14219.341. as per Microsoft Website.

If you are not getting to know about incoming calls or messages,
try resetting your phone in Setting > about > reset,

and if you have tried resetting and still facing issue,
you can get notification in Notification Center about phone and messages,

notification center

or you can add icons in Quick Status like,

enter image description here

Source :

Make sure you are using latest version of windows phone 8.1 thats officially,
LUMIA DENIM - 8.10.14219.341. as per Microsoft.

If you are not getting to know about incoming calls or messages,
try resetting your phone in Settings > about > reset,

and if you have tried resetting and still facing issue,
you can get notification in Notification Center about phone and messages,

notification center

or you can add icons in Quick Status like,

enter image description here

Source :

1
source | link

Make sure you are using latest version of windows phone 8.1 thats officially,
LUMIA DENIM - 8.10.14219.341. as per Microsoft Website.

If you are not getting to know about incoming calls or messages,
try resetting your phone in Setting > about > reset,

and if you have tried resetting and still facing issue,
you can get notification in Notification Center about phone and messages,

notification center

or you can add icons in Quick Status like,

enter image description here

Source :