I think a lot depends on the brand of cell phone from what I have read. I do know that most people have better luck trying to keep the phone outside the odiments box and possibly in a tank bag. Most cell phone cords are just a cable with 2 male 3/32 plugs on them. These can be made any length. If my memory is correct the BMW cord is about 17 inches long and could stand to be longer. I think a visit to radio shack could fix you up there.
One other thing, be sure the cable is fully seated in the phone and the BC3 and see if wiggling the plugs makes a difference.
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747,891 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 96,669miles (new)
Total BMW miles 509,508
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383