Obviously, if you're outside the UK you can't text that number to donate.
I wasn't sure whether I could donate from the USA...it used to be so easy donating to Comic Relief in the UK, in every school, every workplace, just texting a word to a number...
You can donate here:
Click on the pic above to go to their secure site or this link here and you can donate to Comic Relief and save lives using Paypal (I contributed in dollars by changing the currency in the drop down list).
The only thing you can't do if outside the UK is get the UK government to claim GiftAid on the donation.
And as you've watched David being serious, here he is being funny too on Comic Relief with Catherine Tate.....before she was Donna: