As with Harry, I definitely have 'an idea', but was hoping that you might know the actual answer..No idea.
It would seem pretty likely that devices susceptible to interference from a 'smart' meter would be similarly susceptible (quite possibly more so) to the signals from mobile phones, but since the latter were probably much more ubiquitous back the than were 'smart' meters, one would have thought that it would have become primarily known as a 'problem proximity to mobile phones', rather than a problem with proximity to 'smart' meters. After all, if the devices in a CU were repeatedly tripping as a result of mobile phones in the property, the CU (or, at least, it's contents) would have had to have been replaced, wouldn't it
Kind Regards, John