In the administration specification for frequency allocations in the private mobile radio sector 'Verwaltungsvorschrift fE-r Frequenzzuteilungen im nichtoffentlichen mobilen Landfunk (VVnomL)' dated February 2014, the first mention is made of frequency pairs for digital mobile radio which, in contrast to the previous.
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I use Mr Number and AVG Mobile to block unwanted calls/texts... Neither Mr Number nor AVG Mobile, nor Call Control - Call Blocker - Android Apps on Google Play, which I currently use, can block the Sprint Email to SMS spam I'm currently receiving.