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How do I check cell signal strength on IPAD? 

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The signal strength, which can accurately be obtained by curve fitting, only depends on fundamental parameters (including the line strength), thus enabling quantitative detection without calibration procedure.
The procedure accurately determines the effective cell radius using a linear regression of the RF signal strength samples.
It is therefore important for cellular network operators to understand how radio network characteristics (such as signal strength, handovers, load, etc.)
Signal-strength averaging can help, but there are two restrictive factors.
Simulation results show that the proposed method find cells with strong signal strength, long sojourn time and low cell load according to the movement direction.
The Eye Chart Pro app installed on the iPad is reliable for VA testing only when the Snellen VA is better than 0.1 (20/200).
Dynamic range is rarely measured in signal-transduction studies, but our experiments using model-breakpoint analysis suggest it may be a greater determinant of cell fate than measured signal strength.
A novel aspect of this letter is that we recorded the signal strength data at the cellular modem in the field rather than at a cell phone tower and therefore does not require the cooperation of the cell tower owner.
This study intends to help cell-edge users to have better signal strength.
In this paper, we propose a signal-strength-based approach to evaluate how well a sensing field is covered/monitored.