Analysts say that a move to ban something that residents of Mosul cherish so much can mean only one thing: Isis is increasingly desperate as it loses territory in Iraq and Syria.
"They're scared, paranoid, fearing what is coming for them next," said Nabil Jasim, a professor at Baghdad University's college of media and journalism who monitors the group's slick propaganda videos. "They want to cover up their mounting failures, to stop people from seeing the group's problems on their TVs. They fear that if residents see the losses in battle, they could be inspired to rebel."
The campaign comes as Iraqi forces, backed by US airstrikes, wage a major assault on the city of Fallujah, threatening to drive the group out of one of its most important strongholds. Iraqi authorities have been broadcasting reports about fleeing Fallujah residents expressing anger at the brutal Isis rule over their city, which the group seized in January 2014 and where its fighters initially drew support from locals.
Mosul - Isis' crown jewel -- appears to be the next target for Iraqi forces, who have captured a string of major cities such as Ramadi and Tikrit from the group.
Officials estimate that Isis has gone from controlling nearly 40 per cent of Iraqi territory to less than 20 per cent. Losses in Syria have been smaller but still significant.
The campaign against satellite television began last month, according to the group. For a year, analysts say, Mosul's cellphone network has been mostly disabled by the group.
Last month, militants began collecting personal data on Internet users in the city, said Suha Oda, an activist originally from Mosul who is critical of Isis.
Speaking by telephone from Iraqi Kurdistan, she said the group has been threatening to cut off electricity to businesses and residences in Mosul that do not hand over their satellite dishes and receivers. The deadline for doing so is the beginning of Ramadan, which starts this month, she said.