The software Kucall by Koogee allows free phone calls.

According to KUCALL's promise to its users, the CMWAP SIS version was officially launched at 8 PM on June 9th, mainly applicable to Nokia S60 models and above. We thank all friends who helped with the internal testing, and KUCALL will reciprocate everyone with always-free calls. The QD version is currently under intensive development, please stay tuned for the announcement of the internal testing.