Methods implemented on mobile devices and stored on non-transitory process-readable storage media enable selectively blocking tune-ways to functionalities of a Dual-subscription, Dual-standby (DSDS) mobile device to avoid impairing high-priority calls. An embodiment method implemented in a call manager executing on a processor of the DSDS mobile device may include determining whether a tune-away is blocked based on whether a high-priority call (e.g., VoLTE call) is active on a first functionality, and blocking the tune-away to a second functionality in response to determining that the high-priority call is active on the first functionality. The method may further include allowing the tune-away to the second functionality in response to determining that the high-priority call is not active on the first functionality. In some embodiments, the first functionality may be a packet-switching subscription (e.g., a LTE subscription) and the second functionality may be a circuit-switching subscription (e.g., a GSM subscription).