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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12 freelance font une offre moyenne de $117 pour ce travail
Hi there. I'm very interested in updating your app. Let me do it for you with high quality. Please see your PMB for more detail. Thanks :)
Hi Philipp i have experience with inApp model which your app needs. It will be typical non consumable item. Consider my offer.
Company having team of 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, we are very interested in your project and can do it well. Please see the message we sent to you in "Dashboard"->"My messages". Thanks.