I don't like using my phone for the exact reason of EMI interference and call interruptions and storage space but I understand why others do. Have you guys considered trying something like 3M EMI shielding tape? For the record I have no idea how effective it would be.
Thank you Relic for your suggestion however the solid aluminium case serves the mojo quite well in that regard. The problem lies in the cables that we attatch both input and output and the variations thereof. These act as Arials feeding directly into Mojo. A phones level RFI in close proximity to mojo is very severe and therefor this issue is not easily solved without compromising Mojos performance this is because when a phone looses signal it ramps up the transmitt levels dramatically and these can be on any number of frequencies. Some cables are adequately screened and with those there is unlikely to be a problem, but with unscreened types there may be. That is why we recomend that for critical listening and in environments where a signal is likely to be lost that you switch to airplane mode.
http://solutions.3m.com/wps/portal/3M/en_US/Electronics_NA/Electronics/Products/Electronics_Product_Catalog/~/3M-Embossed-Aluminum-Foil-Shielding-Tape-1267?N=8704974+3294002001&rt=rud