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Only people with unlimited text messaging plans should install cWords-SMS.
Do the math: The typical cWords-SMS game will mean 40 SMS messages sent and another 40 received. (They'll be sent directly between the cWords-SMS on the two devices, so you'll never see them!) Let's say your carrier charges you $0.25 for each of the 80 messages, a figure at the low end these days. You'll get charged $20 for a single game. Imagine you play a game every day for a month: $600!
Just don't do it! Stick with Crosswords, which uses your data plan, unless you have unlimited SMS.