I have had this issue once, the best way i found around it (usually it's a 2.4GHz phone and a router which shares the signal) switch your phones to a channel above 12 if possible, then switch your router from the standard 6, to channel 11. This channel i usually reserved for specific devices (not portable phones), that the average person does not own.
To be honest i have done some research on this, and the first 6 channels on your router have different numbers, but emit the same frequency.. atleast close enough as to not matter. Channel 1-6, 7, and 11 all have reasonably unique signals, but i still say go with 11.
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