take Gtalk mobile with fring!
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download fring from the sms you receive
follow simple instructions to install and register
Minimum requirements
1. Applicable 3G or Wi-Fi Symbian 8 or 9, Windows Mobile 5 or 6 and UIQ handsets (see visual list) with 3G/GPRS/Wi-Fi network coverage.
2. If using over 3G/GPRS networks, a data plan allowing you to surf the Internet from your mobile handset.
3. 200-375kb of available space on memory card or phone.