Signal Strength and Speedtest
Signal strength of TPG
TPG seems to be using LTE BAND 40, TDD 2300MHz as shown in the test. From what we understand, it also operates under BAND 8, 900 MHz.
Here is a screen shot of the TPG signal strength tested in Woodlands Ave 9. The Huawei Nova 3i is used with 2 SIM, one from TPG and the other is a Zero1.
Here is a speedtest result conducted on the SIM.
Updated : Speed above ground from Woodlands down to Bukit Batok are generally very stable and signal is strong. Here are some speed test results. TPG seems to have the strongest signal in the WESTERN part of Singapore above ground. North Eastern is poorly covered unless you are switched to Band 40 which is probably found indoors.