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Please have a look at this scenario...

Let's consider,i have contact object and mobile_number field in that object.When ever record is created in contact mobile_number field should be updated with in three days?if not mail shoud be sent to some can we achieve this?

I hope you can acheive through workflow rule and add time based trigger.
Rule criteria - may use last modified date / createddate
use formula field to know the mobile field is updated or not and execute email notification.

You can do this with time-based workflow. Create a workflow rule on the Contact that fires whenever a record is created. In your criteria, check that mobile_number is blank: ISBLANK(mobile_number). Then click Add a Time Trigger, and add a time trigger that runs 3 days after the record created date. Once your time trigger is created, you can create an email alert associated with it. 

Once this rule is activated, the email alert will be sent three days after a record is created, if the mobile_number field is blank.