I guess the generous data is given for local usage, the rest of the countries that tap to the local data pool is added bonus. 5Mbps is reasonable for roaming data, it is not really considered throttled speed too, throttled speed is those 0.5Mbps and below.now only 5Mbps. To be fair, can still stream 1080p YouTube video and web surfing decently. For what u can do on mobile phone, it is enough. Just that did not expect eight to throttle the speed while again giving crazy amount of data and now giving rollover data