Setting the preferred line for all business contacts on a Dual SIM iPhone

Unfortunately, iOS doesn't have a native feature to automatically assign a preferred line for calls based on contact type (personal or business). The default line setting applies to all outgoing calls, not based on contact categories.

Alternatively, consider providing feedback to Apple about this feature request. They often incorporate user suggestions into future iOS updates, so your input might contribute to a solution in a later release.

Until a built-in solution exists, the manual adjustment may be the only viable option, unfortunately.

Suggestions and Feedback for improvements --> Apple Inc says; "We read all feedback carefully, but we are unable to respond to each submission individually."

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