Low-income communities rely on certain older networks for access to the internet. But if Sprint has its way, one major network providing access to underserved areas will no longer be available to schools and others in many low-income areas.

“WiMax” technology was developed by the tech company Clearwire and marketed by Sprint before 4G-LTE networks made them obsolete, according to CNN. But the networks, which Sprint markets for as little as $10 per month, are still used in many low-income areas, including by schools, seniors, and the disabled.

After Sprint bought Clearwire in 2013, it decided to shut down the WiMax networks, and the company now says the shutdown is slated for early November.

But the nonprofit digital access groups Mobile Beacon and Mobile Citizen are challenging Sprint’s decision in a Massachusetts court. They say that as many as 300,000 low-income people will lose internet access if the WiMax networks are disabled.

The groups want a three-month extension, which they say will give low-income groups the time needed to transition to the LTE network. They are also suing Sprint for slowing device speeds after a certain amount of data is used, and for easier access to the company’s new LTE-enabled devices.

Sprint says they notified the groups about the change-over in 2014, and claims that most educational institutions have already made the change.