Femtocells are rarely subtle devices, including Vodafone's earlier Sure Signal models. That's what makes a newly revamped version of the Sure Signal so noteworthy -- it's very nearly unintrusive. The new edition plugs directly into a wall outlet and doesn't occupy more space than a night light, letting it dish out 3G in low-reception areas without becoming a conspicuous part of the landscape. It's also a better pick for offices, or just crowded homes, now that
