Phone GPS and consumer GPS units use the same chips and radios; you're not going to see any difference between the two as long as the phone's processor isn't too slow to run the OS (ex iOS 9 on a iPhone 4); you could get app freeze and the display could fail to update.
I use Waze as well for traffic and smokey reports. Its speedometer is plenty accurate and suitable for staying legal. Network coverage doesn't matter, the speedometer is calculated using GPS alone.
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