> Who pays the extra cost for a call to a mobile phone, the caller or the receiver? The caller. You don't pay to receive normal calls unless you're roaming (si

> Who pays the extra cost for a call to a mobile phone, the caller or the receiver? The caller. You don't pay to receive normal calls unless you're roaming (since the caller can't know you're roaming, it wouldn't be fair to make the caller pay the roaming charges). > they seem to have inherited a lot of North American phone operator customs (like 850/1900 radio bands and CDMA). The radio bands make sense, since the whole American continent is a single ITU region. As for CDMA, here on Brazil initially it was only Vivo on CDMA and the rest on GSM, but then Vivo also switched to GSM some time ago. > They would have deals where calling someone on the same operator was free. We also have these deals here. And also here, number portability muddled things: while before for instance 95xx to 99xx was Vivo and 90xx to 94xx was Claro, nowadays you can't be sure (and that's before they added an extra "9" digit before all cell phone numbers, making them 9 digits instead of 8).