A very few gateways do however support a very limited subset of META tags, but tests show that if you need to use them, there's something wrong with the gateway. For instance, one gateway does not support normal bog standard HTTP cache control, and the only way to control its cache is to use special META tags. Obviously, a user coming in from another gateway would not be able to use the same code.

Bottom line: don't use META tags. There's bound to be a proper way of doing what you want.

The most commonly attempted META tag is the <meta http-equiv="refresh" content="1;http://somewhere.com/">  that tells the browser to load the specified URL after a certain time has passed. WML already contains a tag for this called <ontimer>.