[GadgetKen]

Originally Posted by DRNewcomb

May be based on the port the application uses. Common ones like 80, 25 & 110 are OK but the VOIP ports are not?

Suspect that is the case. There was an article in the Royal Gazette that they would be offering free internet in the airport. Suppose VOIP tunneling could be used to circumvent that, but in the airport, probably a quicker and easier solution is just to use a Bermuda prepaid calling card at a payphone (plus the voice quality is probably better and you have a nice picture card souvenir).
Have a Digicel Bermuda prepaid sim card. Note that these can be kept alive by using credit card internet refill (go through the Jamaica rather than Bermuda Digicel website and click on WebFlex); only BD$10 has to be added every 60 days. Digicel refill vouchers from other countries in other currencies can also be loaded and convert to the proper currency (I did this in Union Island in the Grenadines).
Can be used at decent rates on any Digicel network in the Caribbean, although call-back prepaid sims can sometimes be cheaper in some countries (excluding Bermuda, where local prepaid sims are cheaper than United Mobile call back sim or US postpaid regular sim chip roaming).