The Silicon Valley giants would be forced to give iPhone and Google-powered smartphone users access to cheaper deals when subscribing to their favourite apps.

The study found smartphone and tablet users will be forced to shell out extra because of a 'stealth' levy of up to 30 per cent the tech giants impose on in-app purchases.

CMA previously gave Apple and Google ‘strategic market status’ for their dominance in the mobile market

The Silicon Valley giants would be forced to give iPhone and Google-powered smartphone users access to cheaper deals when subscribing to their favourite apps.

Buy an app subscription today and there is a good chance Apple or Google is taking a cut. The CMA wants developers to be free to point customers elsewhere to pay and is asking the…