is the signal bad because of my phone or is it the carrier

It looks like the phone was either in Airplane mode or you had no cellular signal for some long periods of time. Were you in a building that has lots of metal? Underground?

Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM 10.2 using Tapatalk 4
 
neither. have been outside most of the time and when i've checked the screen it was full bars.
 
I don't know what to say - that screenshot is clearly showing black segments (no signal) for almost half the time.

You could try GSam Battery Monitor Pro: http://market.android.com/details?id=com.gsamlabs.bbm.pro (there's also a free version) and take a look at the Radio Detail
ma2ada6a.jpg
it'll give you a clear breakdown of your cellular signal.

Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM 10.2 using Tapatalk 4
 

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