[bylo]

They are a reputable company. I purchased a Mobal SIM from The Travel Insider website a couple of years ago. After you buy the SIM there is no ongoing charge and the card does not expire. You do not have to buy air time in advance. Instead you pay only per-minute when you use the card to make or receive calls. The charges go against your credit card. I have had single charges as low $0.80 (for SMS.)

The phone number that they give you is in the UK. Unlike UM and other such cards you make calls directly. There is no call-back. They also have voicemail and an e-mail to SMS feature. Their website "My Account" pages let you track usage.

Mobal is expensive compared to UM etc. but it is a very good, reliable service. I have never had problems with their SIM. I cannot say the same for UM. I suppose you get what you pay for.