Magic Jack error 3002 How do I fix this problem?

I am glad that helped you. But I found that was only temporary solution in my case and it would give same error again (usually in a day).

This is a common problem with MJ+ it seems from a quick google search. I faced the same issue again and again and tried a bunch of things. I did a few things which resolved the issue (though I am not exactly sure which did it). I will list them in reverse order... please try the first one and if that doesnot work out please go to setup 2, etc. Leaving applied what you did in step 1. (ie: I right now have all the things done and so not sure even if they work in combination- ie: multiple issues).

STEP 1: MJ has shipped a cheap USB adapter. But any decent USB adapter from any where (you dont need to spend a fortune. Any 5$ to 10$ adapter should do. I used one that was lying around in the house. Some people even report that this improves the sound quality in the MJ+ and reduces the random noise. I am not too sure of that part as I don't use MJ+ much. If this doesn't do the trick move to step 2; leave MJ+ connected via the new adapter.

STEP 2: MJ has shipped a very slim Ethernet cable with apparently untwisted wires susceptible to EMI. Who knows may be rest of the wires near the MJ+ were interfering with the data transmission. Connect any regular Ethernet cable from router to MJ+. I had a patch cable lying around that I used. If that doesn't work move to step 3, leaving this and previous steps done.

STEP 3: Some people claimed that at times the router block certain MAC (firewall) and that causes that problem. That was not the case for me, but I do have MAC authentication enabled on my Wifi router so I added the MJ+ MAC to the list of allowed devices. Its MAC begins with 6C:... Look through routers logs to find it or google for help on how to find MJ+ MAC. DO NOT GO to MJ+ support. They have clueless homeless indians sitting there for support (no offence to indians - I am one too). So they are bound to confuse you even more. Do not seek MJ+ support help... other users will be more knowledgeable.

STEP 4: Some people claim this issue happens when your MJ+ does not get a static IP address. So assign a static IP from the range available to router DHCP. Tell it to assign the device with MAC 6C:xxxxxxxxx the IP address XXXXXX. I know this was not the issue for me as well because one I got error 3002 and I checked the IP address that the MJ+ had at that time and it was the same it had since so many days. (Yes I had done yet another thing, turned the DHCP lease to 30 days instead of the default of certain hours.)

STEP 5: One thing to do also is to increase the DHCP lease in router settings to make sure its not changing too quickly for the MJ+.

STEP 6: Yet somewhere else I saw people insisted that we use a static IP that is out of router DHCP address range (which doesn't make any sense as the static IP was already marked as exclusion under DHCP setting and dedicated to my MJ+ for assignment -- but hey who is arguing. At this point I was so desperate I could try any thing).

STEP 7: Yet again some people said you have to push the MJ+ via MJ site to use the static IP. They said to fix that there is this way (though some people claim that doesnt work - I am not sure if it does but whats the harm in trying?). Go to http://my.magicjack.com/ and login in. Then under "Call Features" menu dropdown select "Advanced".Under Static Configuration uncheck Use DHCP and type in an IP Address which is not from the range available to your router DHCP. I used the following settings:

So in simple words I am telling MJ to use 201 (because my router assigns DNS from the range 2 to 200), and to talk to Gateway and DNS (both is the router IP address) and finally I used the Google DNS 8.8.8.8 as the optional DNS2; in case my ISP messed up their DNS etc. Use your own relevant IP addresses please.

STEP 8: Some people correctly advised that check for loose connections. Many times the outlets/extension bar is so crowded with the adapters that some of them are loosely connected. Make sure you have firm connection.

STEP 9: I know this is not a solution, but its the first every one told me... restart everything. It is at the very least a temporary solution.

STEP 10: If nothing works for you (which I highly doubt), there is only one thing left to do. Carefully take MJ+ to the nearest freeway and properly lay it in path of an oncomming truck. The satisfaction of shredding it would be worth it! (if nothing else seems to work for you) 

***DISCLAIMER: THIS IS A JOKE AND I AM NOT ADVOCATING ANY SUCH ACTION AND NOT RESPONSIBLE IF YOU END UP DIEING AS YOU WERE NOT FAST ENOUGH TO MOVE AWAY FROM ONCOMMING TRUCK OR IF YOU ARE BLINDED BY FLYING SPLINTER OR WHATEVER. ALSO WHILE THIS GUIDE MIGHT SOUND OTHERWISE I AM NOT UNGRATEFUL TO MJ. THOUGH MJ+ IS NOT THE BEST AND SUPPORT IS POOR, YET IT HAS SAVED ME FROM RIDICULUS CHARGES JUST FOR A HOME PHONE"

All the best. If it works (which I am 99% sure it will) just remember me in your prayers and well wishes.

Cheers

Umar

The only thing I had to do was. Unplug everything and I put back the same way everything, no money spended, no trouble.