(I entered a UK number complete with country code and the site claimed to have sent me a verification text, but nothing has shown up after five minutes)
I use Twilio (http://twilio.com) for sending text messages, and rely on them to provide somewhat global support. UK should be supported, but their logging does show that they couldn't deliver your text message. I filed the issue with their support system, so hopefully they'll resolve this.
I will add list of countries that are supported though!
It looks like you have a nice MVP there. Good work.
I found the "Pricing" page to be needlessly confusing. There's a lot of room for optimization there.
I completely agree with Pricing page being confusing... It felt fine when I initially created it, but hours after launching I want to remake it completely. There are only two main options to tell people about, and two different prices - seems like all that text isn't really required.
Also, pardon my ignorance, but what do you mean by MVP in this context?
In terms of the Pricing page, there are two possible ways to deal with the problem. One, of course, is to fix the page. The other is to fix the pricing model.
I assume you've already given your pricing a good deal of thought, and have some reasons for having priced things the way you did, but off the top of my head, if it were me, I'd be offering pre-pay options, with steeper discounts for larger purchases.
In other words: something like 20 messages for $5, 50 for $10, 150 for $20-- and forget about the "monthly" plan altogether.
But, as I said-- that's just a gut feeling, without any real analysis. I imagine you know what you're doing.