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Well businesses can promote their product/service by encouraging customers to use their brand Apps that are available for both Android and IOS. You can promote offers, do customer survey and in exchange offer them something so they feel valued and cared and would keep in touch for future updates.
I give you an example, O2 a British telecommunication service provider market their business through their android App. They send customers every two weeks a coupon for a free premium coffee from Caffe Nero or Starbucks. This way their customers always checks their apps for news and updates for products and services, I think its very efficient.