I cannot connect my Plantronics Voyager Pro to my iPhone 4.

You want to turn off the power to your headset and turn off your phone. Remove for 30 seconds the battery from the phone and reconnect. Then follow the pairing instructions found on pages 4-5 in this link for the Plantronics Voyager Pro+.

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It may have to do with the settings that are listed on Skype. Because you are using the headset with your phone, it should work with the Skype application, so please check your settings. If it continues to not function correctly, try re-pair or subscribing again.

Below are two links which may help you solve your issues:

Plantronics Voyager Pro User's Guide

Plantronics Voyager Pro Pairing Instructions

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The pairing instructions are found in the link below for the Plantronics Voyager Pro+. Follow them closely, and you phone's pairing instructions, and you're good to go.

Plantronics Voyager Pro+ User's Guide

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Try turning both your phone and headset off and on, and then repeat the pairing process.

Here is the link to the Plantronics Voyager Pro User's Guide.

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Make sure that your Blackberry's headset mode is activated. If the headset mode is turned on in the Blackberry menu and settings, you may also need to re-pair the headset to your phone to make sure that it has a good connection. Before running through the pairing process, be sure to totally delete the headset from the Blackberry's menu. You may want the headset turned off for this process.

Once you make your Blackberry discoverable, then put the Plantronics Voyager Pro headset into pairing mode by holding the power button until the headset flashes red and blue. Here is the link below for the Voyager Pro pairing instructions.

Plantronics Voyager Pro Pairing Instructions

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Try to re-pair the headset to your phone to make sure that it has a good connection. Before running through the pairing process, be sure to totally delete the headset from the Blackberry's menu. You may want the headset turned off for this process.

Once you make your cell phone discoverable, then put the Plantronics Voyager Pro headset into pairing mode by holding the power button until the headset flashes red and blue. Here is the link below for the Voyager Pro pairing instructions.

Plantronics Voyager Pro Pairing Instructions

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Make sure that it has a good connection, try to re-pair the headset to your phone. Before running through the pairing process, be sure to totally delete the headset from the phone's menu. You may want the headset turned off for this process.

Once you make your cell phone discoverable, then put the Plantronics Voyager Pro headset into pairing mode by holding the power button until the headset flashes red and blue. Here is the link below for the Voyager Pro pairing instructions.

Plantronics Voyager Pro Pairing Instructions

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If you would like for your Bluetooth headset to stream music or any other audio applications to your phone, the Bluetooth profile in both devices must support Advanced Audio Distribution (A2DP) for audio streaming. Unfortunately the Explorer 330 does not support this newer technology. I would suggest updating your headset to a newer model but remember your phone must also support A2DP. The Plantronics Voyager Pro+, Voyager Pro HD & the M1100 Bluetooth profiles support A2DP. I will include a link for Bluetooth headsets below.

Bluetooth Headsets that support A2DP

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Please bear in mind that newer phones are like small computers, so they may become corrupt over time and you may need to reset them every so often. Simply turn your phone off and remove again the battery for a few seconds, then replace the battery and turn it back on again. Make sure the phone doesn't have any bluetooth interference loaded on. On the link below for the Plantronics Voyager Pro look at "Listen to the Voice" for turning the headset on and off to reset for pairing and follow the pairing instructions in the manual.

Plantronics Voyager Pro+ User's Guide

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iPhone 4 will not pair