Good to see our little app has got some positive feedback
Firstly on the charging thing; We're not O2... therefore we cant use up your allowance, nor can we put charges on your bill - we are charged for sending MMS messages, so therefore we have to charge you.
After PayPal fees, outgoing messages, and the cost of running this service, it's not as if we're rolling in cash at the end of it at your expense - trust me
Long term plan is to get interest/co-operation from the networks... which hopefully will extend to limited access to billing and allow O2 to bill people for outbound MMS sent through our application.
On the flutter comparison, flutter does not send MMS messages.... it uploads your image to a website and then sends the recipient a link to that message... which cannot be viewed if the recipient doesnt have an internet-capable handset. It also means the recipient pays to download the message.
teleflip and other eMail addresses do not work in the UK. There is a third party service (us again) that lets you do this in the form
number@iphonemms.net ... but again, you need to purchase credits.
Last, but not least, we're not some faceless corporation ... we're two independant developers; myself (Ross McKillop) and Ed Lea (creator of TV Guide and a few other popular apps) that are trying to provide a solution that hopefully the networks will pick up on.
We provide quick (in most cases!) and informal support through the forums at
http://iphonemms.net/forum and by PM/eMail etc...
We have many happy users who have been using the web-based app for over a year... so I hope this goes some way towards trusting buying credits from us

- just ask them.