Okay I don't think you have friend requests turned on because I can't find you in the lookup.
I cache exclusively with my Iphone and love it! Get the official Groundspeak geocaching app - it's worth every penny. I have an Iphone 4S and have NOT upgraded to iOs6 - do not upgrade if you haven't already because the Apple maps are terrible and mess with that app.
You don't have to be a premium member to see all the caches, but you can only see "premium" caches with the membership. It gives you other perks as well like reports on new caches, etc. I was lucky enough to get a gift
<3 and I have to say I'd pay for it a million times over - it's a lot of entertainment for not much money.
I have not done letterboxing but my friend Dana (DarthSunshine on SCS) has and says it's so fun! We have some near here I keep meaning to bring a stamp to!
I'm so glad to see you here!