Smartphone or Not?

Another decision I'm facing for my London trip is whether to bring my smartphone or not - well, I'll probably bring it, I'm just not sure if I'm going to use it! :)
I do have an old 'back-up-cellphone' which I will be using for the trip, but I just love my smartphone's camera and the photo apps I'm using and being able to update Facebook and Instagram ... Unfortunately it's so hideously expensive to connect to the internet on my cellphone now, and I'm not sure that it's going to be worth it.

I've been thinking along the lines of bringing the phone to take regular photos - no need to connect to the internet doing that, meaning that should not be so expensive ... and then I'll simply upload the photos when I get back home, and let Instagram and the other photo apps work their magic then. The only thing lost on that is I won't be able to upload the photos when I actually take them, and I won't be able to "check in" on Facebook or add the photos to my photo map in Instagram ... but I guess that's not the end of the world, right?! :-)
I think I'm going to do that - and at least that should keep me occupied when I travel from Mamlö Airport on Saturday September 29th, right?! :-) Being able to relive all the great moments from the trips by uploading photos isn't so bad! *lol*