My son was going to represent his class in a Moot Court in the US and being the first child to get to travel alone, we were all very nervous and excited at the same time. Although he was staying with family, we still wanted him to be locally connected with us easily. Knowing the US culture, we got him a matrix sim card for his use there. While he was there, it was very easy for us to stay connected. Infact even he was quite happy with their services, for he could also use it for internet purposes for his moots. Matrix is more than just for calls.