Just text 82ASK (82275) requesting a location or landmark and a text is sent within five minutes with a link to a WAP page containing the map. Text directions can also be supplied along with the map. Ideal if you’re lost or want to find somewhere in the area quickly.
The downside is the cost. The service will cost 50p per map in addition to the regular £1 per question asked to 82ASK, which seems a bit hefty compared to the price of mobile internet monthly rates these days (although obviously, not all phones are going to offer that).