If you have a pay and go O2 sim card that gives you free texts and pictures messages then I would suggest sending picture messages from
Icmeler as you get them free

I discovered this a couple of years ago, the text messages still cost me if I sent them, but if you send picture one's they don't which is great as I love sending lovely sunny pictures to folk back home to show what a lovely time I'm having doing nothing

(and also cheaper than a postcard and gets there quicker)
Andrea