My ISP currently has a severe outage, which is why I'm tethering my Android phone and a MacBook over WiFi. The Android phone is a HTC Desire GSM running Cyanogen 7. I have a stable HSDPA/EDGE connection.
Now, as this is my only phone, it rings from time to time. But whenever it does and I accept a call, the mobile data connection is lost or cancelled. Same for placing calls. Writing texts won't cancel the mobile data connection.
So, whenever I am on the phone, the internet connection goes dead.
Why is this? Is there any technical limitation that won't allow one to call and send/receive mobile data at the same time? If not, can you somehow trick Android into not cutting the connection?