Without any additional information to go on, it's difficult to make any kind of assumption about what these "text message blaster" devices might be. However, one possibility, judging from the messaging from the police, is that the plod are referring to an IMSI catcher aka a Stingray, which acts as a cellphone tower to communicate with people's handhelds. But those are intended primarily for surveillance. What's more likely is that the suspected UK device is perhaps some kind of SIM bank or collection of phones programmed to spam out shedloads of SMSes at a time.
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