To effectively answer this I would need a little more information. Are you streaming the call through the Beyond aids (I am assuming so)? How far is the phone from you as you are making the call? Are you standing next to a microwave oven?
As a hearing aid user, I have had the Widex Beyond aids on my head. If you are not streaming the call to the aids and are putting the phone to your ear, it could be that you are getting intermittant signal from the autocoil. Assuming that the sound is streaming from the iPhone, the phone needs to be 30' from you (per manufacturer). I have found that if you are more than 20' you may get some "crackle" depening on the "noise" in the room. Noise being other electrical/bluetooth interference. Also, fun fact, if I am streaming a call or music to my aids and am standing by a microwave or changing cell towers as a car moves, I will also get the crackling. I notice some "crackle" or a weak flicking in and out if the battery is low as well.
We have typically fund it to be a pairing, battery or distance issue.
Power cellphone off and open doors on the hearing aids. Close door on aids and power on the cellphone. Make sure batteries are not low. Also close opened apps on phone. Also keep in mind you could be getting interference from other devices around you. Distance from you phone can create issues as well.
Usually these resolve any problems but see your provider if it continues.
As with any bluetooth (BT) technology and any other brand of BT hearing aids, Widex BT is not always perfect. The above suggestions usually work and I have definitely heard of interference from other electronics, even old florescent lights. The only suggestion I would add is to make sure your "WiFI assist" is turned off as this can sometimes interfere and cause the symptoms you are referring to. TO do this go to "settings" then "cellular" and scroll to the bottom to find "WiFI assist" and turn it off.
This could be a problem with the Bluetooth rather than the hearing aids. Try these tips:
If those do not help, try the following:
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