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I feel like what you need is to make sure that the app you are developing is accessible. The idea is cool. I really like it. Plus you gotta figure out if it will be connected to the provider. I used apps that were connected tot he provider in the past and it all depended on what type of provider you had. I've had many cell providers in the past and choosing one was hard. I chose one at the end, but to choose it i used usave.co.uk. This service is really helpful because they offer you opportunity to select mobile provider exactly for you from top Uk companies and to compare their conditions. Also on their website you can buy new telephone or headphones for example. You may be confident that they are professionals because you can find a lot of positive reviews. Hope that you will select something.