We don't know if this is just restricted to Telstra in Australia or all GSM WP7 devices, but evidently on at least some Windows Phone 7 devices, call waiting is not enabled. Odd, eh?
Over at Chris Walsh's blog, he demonstrates how to enable this seemingly important feature and it's far from difficult:
Of course there is nothing unique about that code per se, as they are just part of the GSM feature codes which are universal. Anyone else confirm whether or not this is disabled on their WP7 device?
Source: Chris Walsh (blog)
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Daniel Rubino is the Editor-in-chief of Windows Central. He is also the head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007, when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and watches. He has been reviewing laptops since 2015 and is particularly fond of 2-in-1 convertibles, ARM processors, new form factors, and thin-and-light PCs. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.