Just dial 443 from your phone to check your voicemail. Calls to check your voicemail are included in your plan, or are 8p per call if you're using credit. This works both in the UK and abroad. Keep in mind that calls from abroad may incur roaming charges.
If you need to access your voicemail from another phone, just call your phone number. When you hear your voicemail, press star (*) and enter your voicemail PIN. If you don't know your PIN, read this article about how to reset it.
Other useful numbers, which are free but can only be used in the UK and not abroad, are:
1616 to turn your voicemail on
1626 to turn your voicemail off
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