Giles Turnbull has just written an intriguing post over on MacDev Center that may be of interest to ETel readers as well.

Posterino is one of the more interesting new apps I have had cause to write about in recent months. It’s like Pages for your photos, offering pre-packaged templates for turning photos into attractive posters, leaflets, cards and more.

One of the newer features is a built-in postcard sending service, where you design your card in Posterino, then with a simple payment it gets printed and posted for you automatically. No trip to the post office required.

What’s coolest of all is how you pay for this service. You can simply type your cell phone number into a box, to pay via your phone account. A confirmation SMS message will be sent to the phone number you enter (to prevent you entering the numbers of your enemies, obviously) and once replied to, your postcard is on its way. That’s assuming you have a cellphone contract with the right company, in the right country.

Click on through to Giles post for a more detailed discussion of this cell phone payment system.