This slideshow discusses some of the legal and regulatory concerns and issues affecting femtocells in the US. These include:

• Outdoor macrocells may not have the capacity to deliver high speed internet, and thus may attract lawsuits from customers unhappy with the service.
• Femtocell nomadicity, as customer move them to other locations (e.g. holiday/second homes), which may disrupt outdoor networks.
• 911 emergency calls should be available from any femtocell for any user. But what if the femtocell has been moved (see above point)
• Billing issues, including customers believing they were on their femtocell when they weren't (and being charged by the minute instead)
• Voice quality and data speed expectations from customers. Early CDMA femtocells (Sprint Airave) did not include high speed data technology and so it's important that advertising claims match product capabilities.
• Roaming. Can femtocells be used to avoid roaming charges?
• Interception. Can femtocells be used to intercept calls which are handled as normal, but recorded/offloaded to the femtocell owner?