EasyTone then dials the business' 800 access number and the calling card number. The only number visible to anyone standing near the caller is the actual phone number being called. Every time a call is made using EasyTone, its PIN code changes. Secure Roaming for Cellular Customers EasyTone also effectively secures cellular services when callers are roaming. Generally in this situation, networks do not or cannot fully protect a user's number if he or she is on another network because most cellular roaming systems use a static 4-digit PIN that can be cloned.
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