One call every couple of days At least 30 minutes per month
One call every day At least 60 minutes per month
2 to 5 calls every day Between 120 and 300 minutes per month
6 to 10 calls every day Between 360 and 600 minutes per month

How often would you do this? Data Estimation
Once every few days at most About 50MB
Every day, but only a few web pages or email About 50MB
I spend a lot of the time on the web each day About 100MB

How often would you download apps? Data Estimation
Less than 5 per month
About 100MB
5-15 per month
About 300MB
More than 15 per month (though will depend on total number of apps)
About 400MB

How often would you view video clips?
Data Estimation
Once every week at most
About 100MB
Once every few days
About 200MB
A couple of clips each day
About 1GB
A lot of online video About 2GB

How I use or will use my Prepaid Mobile Phone
You could look for:
I make a lot of calls to friends and family and send a lot of texts.
A plan with unlimited standard national call and texts, like $30+ recharges on My Prepaid Ultimate or My Prepaid Daily Plus where $2 gets you unlimited standard national calls and texts until 11:59pm local time that day.
I only make a few short calls a week (each 2 minutes or less)
A plan with included MyCredit to be used on standard national voice calls to any Australian mobile, like My Prepaid Long Expiry.
I make a lot of international calls
A plan with included Extras Credit for standard international voice calls, like My Prepaid Ultimate $30+ recharges.
OR 
a plan where standard international calls are made from your MyCredit like My Prepaid Long Expiry or My Prepaid Daily Plus. Rates can be found at optus.com.au/prepaidint
I only send a text every now and then.
A plan with included MyCredit to be used on standard national SMS/MMS to any Australian mobile, like and Long Expiry.
Optus Mobile Fair GoTM Policy applies to all Prepaid plans. All of the above plans and inclusions are for use in Australia.

How often would you do this?
Data Estimation
Once every few days at most
About 150MB
Every day, but only a few web pages or email
About 600MB
I spend a lot of the time on the web each day
About 2GB

How often would you download apps (not games)?
Data Estimation
Less than 5 per month
About 100MB
5-15 per month
About 300MB
More than 15 per month (though will depend on total number of apps)
About 400MB

How often would you download games or similar apps?
Data Estimation
Less than 5 per month
About 200MB
5-15 per month
About 500MB
More than 15 per month (though will depend on total number of apps)
About 400MB+

How often would you view standard definition 3 minute video clips?
Data Estimation
Once every week at most
About 150MB
Once every few days
About 200MB
A couple of clips each day
About 2GB
A lot of online video (say 5 clips/day) About 5GB

How often would you stream 3 minute high quality songs?
Data Estimation
One hour, once every week at most
About 600MB
One hour, once every few days
About 850MB
One hour per day
About 4GB
Three hours per day
About 12GB

-

2GB
per month

5-10GB
per month

20GB
per month

50GB
per month
100GB
per month

500GB
per month
Email            
Web Surfing            
Facebook            
Online Gaming            
Skype  
         
YouTube            
IPTV            
Downloading Movies            

Legend
 
  = Yes: This activity should be fine on this plan
  = Caution: You may go over your limit
  = Warning: You will likely go over your limit

Do you use the Internet? How you use the Home Phone
Plans you may want to consider
Yes I make very few calls, mainly using the phone for incoming calls or emergencies
$60 Plan with unlimited data and pay as you go calls.
I make a moderate number of local calls, national calls and calls to mobiles
$80 Plan with unlimited data, entertainment and pay as you go calls.
I make a lot of calls including international calls
$80 Plan with unlimited data, pay as you go calls and World Saver international call rates to selected destinations.
No - Home Phone plan for $22 per month with pay as you go calling for all call types