Are mobile phone jammers legal in the uk - mobile phone blocker Braintree

Are mobile phone jammers legal in the uk,mobile phone blocker Braintree,Basic Info Model NO.: CPJ-P8 Weight: 0.8kg Protection Radius: Typical 5-20m 2ggsm850MHz: 851-894MHz 2ggsm900MHz: 925-960MHz 4glte700MHz: 725-770MHz 4glte2600MHz: 2620-2690MHz ...