Interexchange Carriers and Mobile Phones
Most U.S. and Canadian wireless carriers do not let their customers choose an IXC (long-distance provider). Instead, the wireless carriers send all long-distance calls through one pre-selected interexchange carrier, then bill customers directly for the calls. Fido Solutions, in Canada, lets customers switch to Yak Communications as their PIC (presubscribed long-distance provider), but only for outgoing calls made from Fido's Toronto calling zone. Most U.S. and Canadian wireless carriers also do not support CACs (dial-around codes) either. This is because carriers must put in a lot of effort to bill customers on behalf of IXCs (long-distance providers). Since governments do not require it, and few customers request it, most carriers have never bothered to provide CAC support.
Read more about this topic: Interexchange Carrier
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