April 2017 update: WAS 5 stars. REMOVED 2 stars for adware. Do a google search on "fotaprovider com.adups.fota" for more info. To prevent the spying:

1. Root the phone (I used the PC version of Kingo Root and connected my phone via USB).
2. Install Titanium Backup.
3. Using Titanium, search for "adups" (without quotes) in your list of installed apps.
4. Convert FotaProvider app to a user app within Titanium.
5. Uninstall FotaProvider using Titanium, and possibly the "Wireless Update" app. I uninstalled both.

You will NOT be able to uninstall without rooting.

Posh Mobile probably did not know about this issue when they sold the phones, and I still love the phone, but this spyware problem needs to be addressed.

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Original review:

I bought this phone originally to use as a small media player but ended up getting phone service for it. Pros and cons based on personal experiences are listed below. Overall I absolutely love this device and couldn't be happier with it.

Pros:
-- the price! The phone was priced at $30 when I bought it. It's very hard to get a decent no-contract unlocked Android phone at that price.
-- great size if you're looking for something small. I only know of one other type of Android phone that has a similar size but didn't like the appearance, and the OS version was older.
-- clean, minimal, slick appearance
-- although the resolution is low, the small screen size makes the resolution look decent. This isn't an ideal phone, however, for someone with very poor vision since the text is small. It can be increased, but since the phone size is small increasing the text size means fewer words on the screen.
-- great sound quality via headphones, and the sound output via the speakers was very loud given the size of the phone. A possible "con" is that the lowest volume setting above mute is still a bit loud, but some people might like that.
-- runs Android 4.4.2, which for my needs was just fine. I do not know if any version updates are planned, but there was a small OS patch available to download. The OS version after the patch was still 4.4.2. Phone service was not needed to get that patch.
-- zippy response time given the slower processor speed
-- runs streaming apps without any problems, including Spotify (had to use a version from a year ago to be able to sign in), Jango, and Pandora. I haven't tried any others. Spotify music can be downloaded to the external SD card.
-- streaming videos work ok (only tried Netflix and YouTube) although it seems the frames per second is lower on this phone than with higher-end phones. If you only plan on using this for listening to videos you should be fine, but given the size and the noticeably slower FPS it's not the best phone for actively watching videos. I did not try download any videos so I can only assume that works.
-- games work surprisingly well, although I only tried Angry Birds and Ball-Hop. I don't know if anything like Grand Theft Auto would work on this phone, nor do I know why you'd try.
-- apps CAN be installed to the SD card
-- works with 64gb cards (at least my card works fine, I'd think other 64gb cards would as well)
-- battery life. No it's not the greatest, but how much battery life can you expect in a phone of this size? The battery is small physically since the phone itself is small. I can go a day with light usage (web surfing, checking email, a little music streaming, etc.) and not run out of power.
-- very lightweight. I've had the phone for several days and still can't believe how light the thing is.
-- worked beautifully with a bluetooth keyboard (tried one made by Newtrent). I have not yet tried audio over BT.
-- FM radio, and I mean real FM, not an app that plays FM stations over an Internet connection. You'll need headphones however.

Neutral:
-- keyboard usage is difficult, at least on the stock keyboard and the third party keyboard I installed, due to the small size of this phone, but this is understandable given how small the device is. I have relatively small fingers, so if you have big/fat fingers you might have a lot of problems entering the correct keys even with auto-correct. If you want a really small phone, you're going to get a really small keyboard. Voice recognition works fine, so you can speak words instead of typing them out whenever the voice option is available.
- limited storage unless you use an SD card, although given the phone's price I think this is an understandable limitation

Cons:
-- IMPORTANT: the phone uses a micro USB cable *BUT* it requires a cable with an extended tip. I tried many standard micro USB cables and in all but one the metallic tip wasn't long enough to charge the battery. In the one that did have a tip that was long enough, the connection was loose and I had to keep adjusting it to get it to charge. The cable that comes with the phone works great, including for transferring files, but if you lose that cable you might be out of luck. DO NOT LOSE THE CABLE THAT COMES WITH THE PHONE!!
-- outgoing phone sound can be slightly muffled (I only tried over AT&T and a wi-fi voip call), but spoken words are still understandable. Incoming audio was fine. If you want a phone for hours of talking, this probably isn't your best option
-- camera photos are low quality. They'll probably do fine in an emergency, such as an auto accident or something else where you have to take photos immediately, but otherwise you probably won't be using the camera. And there's no flash.

1 - yes the charging port needs the 8mm micro USB, I took a dremel and removed about 1mm from the bottom where the USB plugs in and blended it to the contour of the phone. Now a standard micro USB fits

2 - yes the keyboard is small, you know this phone is small do of course the keyboard is small. I physically turn the phone to landscape when I text. This makes the keyboard about the same size as the portrait keyboard of my galaxy s5

3 - yes the battery is tiny after it hits 15% it drops super fast. The phone is smaller than a credit card. I do get a full day out it, I use it for phone calls , a little music and texting I do not watch videos or browse the web with this as it is micro sized!

4 - yes this has full android with the play store. You can install any app that any other phone running 4.4 can install.

5 - yes this will fit in the coin pocket of pants. It is micro sized it does have a lanyard slot which I use so I don't lost this phone

It has a launcher installed that reminds me of an iPhone in that all the apps are on the home screen there is no app drawer. You can install another launcher if you want

Quadrant scores

Total 3616
CPU 11059
Mem 1979
I/O 3086
2D 737
3D 1217
Asus transformer performance is comparable

Vellamo

Metal 492.
Browser 1001
Multi core 751

First phone received wouldn't detect a network signal unless it was within a few feet of an antenna (WiFi worked okay). Amazon quickly replaced it (thanks!). The replacement has excellent sensitivity. I attached a lanyard, since it's all too easy to drop this phone or have it slip out of a pocket. I do not use social media. I have three main uses for a cell: phone calls, text messages, and weather. I wanted a small hike/bike/motorcycle phone. This fits the bill, though text messaging is more of a chore with the microscopic keyboard provided. The phone function works fine either with or without an earbud/microphone attachment. Haven't tried Bluetooth yet. Battery lifespan is about 1 - 2 days typically as currently set up. My only complaints at this time are that I can't disable the loud announcement tones it makes when it powers down and up (I use the power-down schedule to save battery at night), and the funky deeper-than-normal USB socket. I was able to pare some plastic off the plug on my battery backup charger and get it to work, but it's still a liability to have a phone that won't accept the same plug that 99% of the world uses.

I love the size of the phone since I really wanted something as a phone that I can occasionally use for other things such as email or GPS, but the battery only lasts about 2.5 days in sleep mode (running no apps, 1-2 short calls per day). It will be reading about 50% and the next thing I know it is dead and turned off until I charge it again. Posh customer service was awful... they said to buy a new battery since they didn't have any (can't figure that one out) and if the new battery didn't work I could send it back and they would look at it. Ended up buying new batter which did nothing to solve the problem. 2-3 days charge to use only as a phone is not good enough especially when it goes from 40-50% power to dead without warning. Just to risky in the even I really need to make an emergency call. Anyone else experience this problem? I'm not sure I want to waste my time sending it back for them to check versus returning it for a refund.