Devices that might interfere with biventricular pacemaker operation are believed to be the same as those for standard pacemakers. Individuals with a biventricular pacemaker should avoid magnetic fields (e.g., not have an MRI). Cellular phones should be worn on the opposite side of the body (and used with the opposite ear) to where the biventricular pacemaker was implanted. Hand-held or walk-through metal detectors may temporarily interfere with the function of the pacemaker. Though reports of problems are rare, the U.S. Food and Drug Administration recommends that individuals with pacemakers avoid leaning against or lingering near security gates or entrances.