Most service contracts are not a single page. The signature page often names a schedule, an exclusions list, or a set of terms you can read online. Once the contract points to those documents, they become part of the agreement. Reading only the front page means reading only part of what you are agreeing to.
Find every document the contract names
Go through the signature page and every heading. Look for words such as attached, enclosed, incorporated, or available at a web address. Write down each document name and the page where it appears. If a web address is given, copy it into your file and save a copy of the page as it reads when you sign.
Confirm you hold the version named
Many documents carry a title, a version line, or a form number. Compare what you hold with what the contract names. Check that every attachment is present and that no page is missing. If something is absent, do not sign until you have it.
Check how changes reach you
Some providers can update linked terms after you sign. Read the contract for the answers to four questions. Can the provider change the linked terms? How will you be told? Does a change apply to a contract already in force? What can you do if you do not accept the change?
Ask before you sign
Put these questions to the provider in writing and keep the answers:
Which documents are part of this agreement? Can I have copies of each one now? Which terms can change after I sign, and how will I learn about it? Where do I send a written notice?
Keep your own file
Store the signed contract with every attachment and every linked page you saved. Keep the written answers to your questions in the same folder. If the paperwork is ever needed again, you will have the whole agreement, not a summary of it.
For the published figures on this site, use the tables here rather than any single document you are handed. Those tables show what the index says about each system, and they do not replace the contract you are reading.