My iphone 4s sometimes wont show voice mail,sometimes wont ring just shows missed call,sometimes wont receive a text till next day. can anybody help me???

My phone sometimes wont show voice mail,sometimes wont ring just shows missed calls,and some text messages wont show received till next day. Can anyone help?

Settings > General > Reset > Reset Network Settings.
Try reseating or replacing the SIM card.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). 
Has any of the above been tried?

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