May remobilize phosphate, particularly when cells senesce or when phosphate becomes limiting. a ribonucleotidyl-ribonucleotide-RNA + H2O = a 3'-end 3'-phospho-ribonucleotide-RNA + a 5'-end dephospho-ribonucleoside-RNA + H(+) By phosphate starvation. Belongs to the RNase T2 family. Extended C-terminus.