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What is a phone jammer - jammerjab kirby bliss blanton

What is a phone jammer,jammerjab kirby bliss blanton,Basic Info Model NO.: CPJ3050 HS Code: 8543892090 Product Description Portable 6Bands for all GSM/CDMA/3G /4G Cell phone, Jammer/Blocker:CPJ-3050 Please contact with us at: Mr.Jerry...