I wrote some code to discover the location providers available. I ran the 
code on my phone (with cell off, gps off, and wifi on). It found the 
NetworkProvider. Turning on GPS it found them both. (cell is v2.3.3)

So I thought that NetworkProvider would be valid for anything that has WiFi 
or network connections. However, I noticed that the cheapo $100 tablet 
(from China based on the build.props file) doesn't have NetworkProvider. I 
understand if NetworkProvider is there, all we need is a network 
connection. However, it reports that the GPS exists, but it's never 
reported a fix. I understand that GPS requires a different radio, and if 
they're as cheapo as they say, why include a GPS chip and not enable 
NetworkProvider considering that they already have wifi built in. (tablet 
is v.4.0.3)

Here's the build.props file:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=IML74K
ro.build.display.id=A710-0.5.3-r498-eng .eng.A710.20120320.213516
ro.build.version.incremental=20120320
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.3
ro.build.date=Tue Mar 20 21:54:28 CST 2012
ro.build.date.utc=1332251668
ro.build.type=eng
ro.build.user=shen
ro.build.host=compiler
ro.build.tags=test-keys
ro.product.model=A710
ro.product.brand=BRONCHO
ro.product.name=crane_a710
ro.product.device=crane-a710
ro.product.board=crane
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=unknown
ro.wifi.channels=
ro.board.platform=exDroid
# ro.build.product is obsolete; use ro.product.device
ro.build.product=crane-a710
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=crane_a710-eng 4.0.3 IML74K 20120320 test-keys
ro.build.fingerprint=BRONCHO/crane_a710/crane-a710:4.0.3/IML74K/20120320:eng/test-keys
ro.build.characteristics=tablet
# end build properties

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.com.android.dateformat=MM-dd-yyyy
ro.config.ringtone=Ring_Synth_04.ogg
ro.config.notification_sound=pixiedust.ogg
ro.config.alarm_alert=Alarm_Classic.ogg
dalvik.vm.heapstartsize=5m
dalvik.vm.heapgrowthlimit=48m
dalvik.vm.heapsize=256m
ro.kernel.android.checkjni=0
ro.product.locale.language=zh
ro.product.locale.region=CN
wifi.interface=wlan0
wifi.supplicant_scan_interval=15
debug.egl.hw=1
ro.display.switch=1
ro.opengles.version=131072
persist.sys.strictmode.visual=0
persist.sys.strictmode.disable=1
hwui.render_dirty_regions=false
persist.sampling_profiler=1
persist.sys.usb.config=mass_storage
ro.setupwizard.mode=OPTIONAL
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.broncho.version=A710-0.5.3-r498-eng .eng.A710.20120320.213516

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