lutful... of ideasPremiumReviews:
reply to TheSMJ
Re: Anyone using a bluetooth gateway? Newer android and ios phones are using BT 4.0 chipsets which may cause problems with older BT gateways.
I have seen Sparkfun bluetooth rotary phone working with some phones but not others.
Two years ago, I tried to build one like that but using an old Nortel touch-tone phone. Sadly it did not connect to my Samsung m300 flip phone and I gave up.