Currently the HTC Kaiser is one of the best smartphones. Among others, it has Wireless LAN, GPS, a 3 MP camera and a UMTS/HSDPA radio. So it is interesting for many business users which also want a built-in keyboard. But many users of this smartphone are disappointed because they sometimes cannot receive or make phone calls. When you dial a number, the device stops the call again. And if someone wants to call you, your phone is not availible.
When you have a closer look at this problem, you may notice that this problem only occurs when you are in a 3G/UMTS network. Then your smartphone displays a “3G” or “H” in the top line. If you are in a GPRS / EDGE network (it displays a “G” or an “E”), the phone works perfectly. As this issue appears at all the different brands of the HTC Kaiser with different networks in different countries (and different ROM versions), this is likely a software problem caused by the phone ROM of this phone. It is also being discussed on xda-developers.com.
There seems to be no solution yet. HTC knows this problem, but there is no update yet. The only workaround is to deactivate the high-speed data connections. This can be done in Settings, Personal, Phone. In this settings dialogue, there is one tab where you can change a setting from “Auto” to “GSM” – unfortunately, these labels are different on my German phone. If you change this setting, your radio will only connect to GPRS / EDGE networks, but your phone should work correctly again.
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