If you do not want unlimited minutes, you’ll be owe for all forwarded calls according to your plan.
You’ll be billed just like you would if you reply the call from your mobile phone. Even if the phone calls are forwarded to a landline.
There is no monthly fee for a phone call or voicemail forwarding on most plans. However, a payment may apply on some older plans. Therefore, if you have a strategy that includes long distance, it isn’t charge on forwarded calls.