sbiddle:richms: Hope they have a plan in place for the end of GPRS if they are supplying terminals that only support that too.
GSM will be around for ever. Globally we'll probably see lots of 3G networks shut down well before GSM.
I saw an article that said 2020 for Vodafone NZ. Can't find the link for it now. Some 3G networks in EU are being closed for 4G use of the bandwidth . AT&T in the US is shutting down GSM so that the frequencies can be used for LTE..
Edit. Found it http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=10684859