^^^^^^
For Europe Matrix is best... INCOMING FREE in most countries... Used by my uncle last year... I used Local Prepaid sims (incoming FREE -- T-Mobile_D1) which is OK for visiting one country, but attract roaming charges if moved to next country.. But all topUps give FullTT... Prepaid Matrix SIM available in Airport counters in Chennai, as told by my uncle... I don't know about other cities...
Reg CHINA... LocalSIMs are available even in Airport (slightly costlier than shops in town)... I have used ChinaMobile (GSM)... Yes Incoming calls are chargeable, but NOT high, comp outgoing calls... Further I have noted one peculiar thing, the call is being charged right from the moment we pressed the green button (so including airtime).. The sales rep told me to dial some *xyz*number_to_dial to get charged less... In fact, this is what I guessed from his actions Reg. coverage, ChinaMobile is very very best, Full signal on China-GreatWall second stage as well as travelling in under-river canal of Shanghai...
In both trips, I will give missed call to my home and they will call me from their prepaid number with some ISD booster...