1) If you need are using Analog line, then nothing to do with Fibre as it is a separate service from Singtel Fibre.
https://www.singtel.com/personal/products-services/more/telephony-services/home-line
Singtel digital voice is free with Singtel Fibre Internet service. The telephone is connected to Singtel ONR (or legacy ONT).
Please make sure which one you have.
2. Singtel has different promotions. Please refer to the sticky thread. You may have to talk to different Singtel channels to get a good deal. Different SingTel sales channels may even compete with each other.
Best recontract offers recently :
1) S$29.9 per month 5Gbps recontract offer with free HB611-SGST.
2) S$29.9 per month 3Gbps recontract offer with free HB611-SGST.
3) S$39.9 per month 3Gbps recontract offer with free HB611-SGST and S$240 voucher
4) S$39.9 per month 3Gbps recontract offer with free two units of HB611-SGST.