It might be a case of stating the bleeding obvious - and you might care to argue with the maths - but Glynn Byrd's blog highlights the massive cost of text messaging compared to email.
For the mathematically
minded, in units of pence per byte: SMS = (12/160) = 0.075 p/B,
Broadband (2699/40000000000)=0.00000675 p/B, i.e. sending an SMS is
nearly 12000 times more expensive than sending an email message using
your broadband connection. [Based on a 160byte text message costing 12
pence, or 40GB of data on BT Broadband costing £26.99 per
month.]
HEXUS.links
HEXUS.community - discussion thread about this news brief
Glynn Bird - Blog