>>> There's no active jamming going on; it's just the way the building is constructed (I assume). You're correct there. Cell signals don't play very nice with

>>> There's no active jamming going on; it's just the way the building is constructed (I assume). You're correct there. Cell signals don't play very nice with concrete and steel. It also depends on who your carrier is and what technology their using. Verizon uses CDMA, which uses a lower frequency (around 800MHz) which gives you better building penetration, as opposed to say T-Mobile that runs on higher frequency (1.9MHz) which tends to have issues getting through all that concrete and steel.