I don't know about the Moment, but the HTC EVO does have spell check.
Menu > Settings > Language & Keyboard > Touch Input > Text Input > Spell Correction.
Also, you can add words to the dictionary by going to
Menu > Settings > Language & Keyboard > Touch Input > User Dictionary.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]