Go to the Phone icon which you will see along the menu bar.
This takes you to the Call Records page as shown below:
Select from the 'All Call Types' dropdown - 'SMS messages only'
You can change the date range to widen your search criteria to go back to several months or even several years etc.
Use the search field to enter in a mobile number to search for all SMS messages that have been sent to that number.
Please note: if you do not see the results for this number try removing the '0' from the start of the number to then see the results of how many SMS messages have been sent.
You will now see a list of SMS messages sent with details of the cost per SMS as shown below:
