Worldsim may promise low prices but they fail to control that the charging is ok. I have been charged 25 US for two local calls on Fiji less than 1 minute each. They will refund it but it is annoying to be cut off in the middle of a call. It took them 48 hours to correct the erroneous charges. During that time I couldn't make or receive calls and had to by yet another top up in order to stay available. Now worldSim will not reimburse me for the top up I had to do in order to be available.