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nRF9160-DK Minimum Required Signal Strength

In certain situations, I and customer are having issues connecting to cell towers. The issue seems to be most consistent when the Link Monitor indicates a signal strength of -100 dBM or less. In some areas, I have a customer reporting signal strength of -120 dBm. In that area, a connection is made from time to time, but the connection is quickly lost.

1) What is the expected signal threshold needed to ensure reliable connection to a tower?

2) At what signal strength, according to the link monitor, would we expect not to be able to connect to a tower?

3) Is there anyway of improving this performance with the DK?

4) In the worst case location above, the customer uses T-Mobile as their mobile phone carrier. They have reliable connection with their phones, so the expectation is the nRF9160-DK should have a reliable connection. Please confirm if this may be do to T-Mobile using a lower frequency/band that the nRF9160-DK does not support? Or is this simply because T-Mobile hasn't approved us? The customer has tested with both iBasis and Hologram.io SIMs.

All feedback welcomed.

Cheers,

Jeff

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