this is the solution for an asda sim card (uk) to check your balance since the usual number with * and # doesnt work - simply call 2732. your balance is read out to you. this is free and you are only charged if you wish to speak to an advisor, so after its read out, simply hang up! until nokia fix the * # calling problem, the only other option is (obviously) to insert your sim into another phone (non nokia or non n900!) to check your balance! i hope nokia do fix this issue in an update, although they surely will need to know about it first, make sure you complain directly to them if you cannot use phone numbers that require symbols!