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Originally Posted by hamid_1
On some international calls, you now hear 'local' progress tones generated by your own exchange, not the overseas one.
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...... or three rising tones from mobile phones.
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There's a variety of things with mobiles, but in a similar vein, to save data, its often the actual phone that produces the tone. It's not uncommon that when you hear a ringing tone, it's your phone, and tha data only starts to flow once the call is answered. I noticed this start to happen some years ago when calling overseas (mostly Germany).