I think that cellphone could be seen as legacy technology much faster than we think.
With cellular operators such as
Vodafone posting £15bn (US$29bn) losses and others such as Orange merging to create
broadband plays it could be that the writing is on the wall for 2G and 3G networks for which operators paid dearly.
T-Mobile's "Web and Walk", all you can eat cellphone internet for £8.50 per month is interesting, particularly for those in rural areas, but it's pretty slow by comparison to a good wireless broadband connection.
The market stats on cellular based handsets is artificial as they are mostly subsidised by business models based upon exorbitant telephony charges. Once these models collapse under the weight of competition from Internet business model technologies such as VoIP I think we'll see the market stats will reflect a different device landscape.
I think the cost of providing cellular connections to rich media learning material will be prohibitive (who pays the phone bill?) and with WiMax on the horizon and commitments to city-wide (and ultimately country-wide) data clouds perhaps Learning Area Networks using wireless broadband might be a better solution to accessibility for all?