So how do you avoid the expensive or annoying ramifications associated with going over your data cap? The best way is to not go over your limit in the first pace.To help with this,use Wi-Fi for large downloads instead of your cellular connection.It is also prudent to monitor your data usage to make sure you stay under your data cap(you can also use this information to decide if you need to consider upgrading to a higher plan if your usage is typical but still over your data cap).Some smartphone have an option for viewing your total data usage for the current biling period,as well as usage per app or web site to help you see where you are using the most data.