somthing in cydia is stopping my 5s from getting reception please help.

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hi,guys I was wondering if someone can help.
my jb iPhone 5s ios8.1.2 isn't picking up service.
when I put it in safe mode its gets reception without fail.
,sometimes it will want to be reactived too.
as there is no current jb at the moment,i was hoping its just a bad tweak.
any ideas?
thanx darryl

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