Broadcast distance and sound quality for special WLAN phones are frequently less than ideal.
The sound quality often suffers if a hotspot is serving more than one web surfer at a time, reports Hannover-based computer magazine c't, which tested several devices recently.
Despite this, the phones, which allow users to link into a WLAN without additional computer or adapter, are relatively expensive.
To make a call at home using VoIP, for example, the authors recommend using an adaptor and a standard cordless phone. The telephone unit is simply plugged into the adapter, which is used as a VoIP router. For those on the go, a headset and laptop are a good alternative, allowing the user to dial into a network at a hotspot.
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