Online technology retailer Expansys has signed a nationwide SIM card distribution agreement in the US with T-Mobile. AIM-quoted Expansys will wholesale T-Mobile SIM cards and pre-pay phones in the US retail market. The US pre-pay and SIM-only markets are less developed in the US than they are in Europe. This is the first major move into this US market sector by Expansys, which is already market leader in this sector in the UK. However, Expansys already has experience in the US as well as a logistical presence. Expansys believes it can replicate its UK model in the US. T-Mobile is one of only two nationwide GSM carriers in the US. The news has helped to perk up a share price hit by disappointing Christmas trading.