add in-app purchase. when clicking on button user can buy functionality to send email/sms. this should be very easy, the app already exists, check it out:
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Provide your details for bid: A team of 3 enthusiasts iOS developers, iOS UI designer and all of them having more than 3 years of development experience. I am sending you my portfolio and queries regarding the app via PMB.
Hi! I am a Swedish iOS developer who really would like to work on this project with You. Please check my Portfolio to see examples of previous app's I have developed and published to the App Store! Danke!