it costs a fortune!
read this thread:
then read my solution below.
i have a solution to using and getting blackberry services in china without paying extortionary costs.
if you're from the uk and heading to china this is the best solution to keep being able to use bb services:
firstly i haven't tested it yet myself with this particular network/sim but when i went i took my contract with me and used wifi only and was able to use everything.
1. you need an active BIS connection in the uk, thing is most networks dont offer it on pay as you go, but t mobile do and theres a great offer of £20 for 6 months BIS connection. the pay as you go sim is free too.
once thats set up and working fine in the uk move on to step 2.
2. now u have a working BIS connection in the uk, turn your data off before you travel to china and when u get there only use the wifi, so turn off the mobile network then turn wifi on, then turn data on.
you'll find that you'll be able to use ALL your applications BBM, etc everything! by only turning your data on when using wifi with the mobile network off you wont pay roaming charges.
3. last step, obviously you wont have wifi whereever you go although many places in china offer free wifi as part of their service i.e. cafes shops etc and the signals pass out onto the streets, but what you should do is purchase a china telecom wifi card, i cant remmeber how much it is per month but it's not ridiculously expensive and once thats set up, load your bb with it and have wifi on all the time BUT with your mobile network off.
there you'll have BB services at a fraction of the cost
i have to add that you will need to carry 2 phones around with you, the other will be your local chinese sim card.