They always seem to have terrible reception in ikea stores. Probably due to large areas of steel cladding and RC slabs acting like a faraday cage. The building owner needs to actively supply booster base stations to provide a good mobile signal in a building like this and Ikea don't seem to do this.
I wouldn't be surprised if this is deliberate. Its pretty well known that ikea never allow any clocks nor any natural light inside their stores, so customers lose all sense of time.
Building for poor mobile reception would just add to this sense of isolation.
