The document outlines several major threats against mobile phone services, including the use of unencrypted user data, reliance on insecure third-party apps, poor server-side security compared to client-side security in apps, lack of proper security testing for apps before release, and accepting unstructured data from unsecured input channels. Developers are warned about using third-party frameworks that could be targeting them, failing to encrypt sensitive user data like Starbucks did, neglecting server-side security, and not thoroughly testing apps for security issues before releasing them. Attackers may exploit unsecured input channels to access cookies and variables stored by apps.