I tried using a shielded cable with same result, though?
AND when using RWAK100 + Optical to Mojo as a stock, if that stack is near my iPhone (foot away), I hear RFI.
Yes, a screened cable (or an optical cable, instead) will make RF interference
less likely, but it's not absolutely bulletproof - if your iPhone is really belting-out a lot of RFI (I don't know the signal quality in your area), then that's more likely to cause problems that push the limits of even quite decent shielding. Having said that, it might be worth you applying a seperate choke to your existing (non-optical) cable, to see if that helps (they're very cheap), even though it's unlikely, if your phone is pumping out enough signal to interfere even when the AK + optical combo is in use.
No one (not even John or Rob, from Chord) is denying that there are
some circumstances in which Mojo may experience RFI issues. It's unfortunate, but RFI is not something one can easily eliminate in
100% of usage scenarios.
The majority of Mojo users either experience zero, or negligible RFI, or manage to find a comfortable compromise in terms of using well-shielded cables, switching their phone to airplane mode whenever near their Mojo, or managing to keep it sufficiently far away from their Mojo to prevent interference.
If you find you really can't keep your iPhone away from your Mojo stack, then I respect that, and I concede that it might be a legitimate problem for you, that might prompt you to find an alternative DAC-Amp. Hopefully, that won't be the case, but if you find yourself in that small percentage of users, then no denials, and no hard feelings - perhaps something else may be a better fit for you, although please bear in mind that many competing products are also not 100% immune to RFI. Unfortunately, life just isn't perfect
I hope you find a workable compromise
