I was planning my trip to Australia and being a solo traveler the biggest issues I was facing was of connectivity. While I was researching about whether buying a sim when I get to Melbourne made more sense or using my Indian number was better, I came across Matrix International Sim Cards. read enough on them, went through their website to understand the rates they were offering in comparison to others and finally concluded that these guys have some great plans. I bought their Australia prepaid sim card and I landed up spending less than a total of Rs 5,000/- on the number. Therefore, if used wisely and one can surely cut down the prices while on an international trip. Also, to add here their customer service is really good.