[Nexus 7 (2013) Themes and Apps] jacksonj51:
New N7 '13 owner and decided to mod the framework-res on the Nexus 7 to enable its voice capabilities. Never been happy downloading 3rd party apps such as Sendhub, grooveip, etc to make phone calls plus they have limitations on the number of minutes included.

I did a search to see if this has already been done but came up empty in any case sorry if this has been covered previously.

***This process takes a total of 5 minutes even though it looks longer!

This will enable incoming & outgoing calls for free. This will work only with a Google Voice account however. Steps below.

This is for KK 4.4.3 stock Rom's as tested, may work on other Rom's but understand this will flash a stock framework-res.apk onto your system. Anyone running Xposed may have issues as well but not sure. I have included a BTS (Back To Stock) zip which in case of bootloop or something wrong you can just flash it to get a completely stock framework back. If you have a different Rom then just replace the BTS zip with your framework-res.apk and it will flash it back to the way you had it... but make sure you backup YOUR framework-res.apk before you do this!

Ok now for the steps...

1) Go here and get yourself a free phone number CallCentric

It will only allow for a NY number but who cares no one will ever see this number since it will be attached to your google voice. Fill in the new customers fields, confirm your email, then goto your dashboard and you should see the following:

Only pay attention to the 2 things you need that are highlighted, write them down or keep this tab open as you will need those 2 numbers in a second.

2) Now flash the zip 'N7_WIFI_ENABLE-CALL.ZIP' After boot up hopefully everything is ok and you should now see the dialer/phone icon in your app drawer. Click on it and proceed to the next step.

3)Once in the phone app go into its settings then select call settings and then select Accounts. Upper right corner select Add account. This is where you will need 1 of those previous numbers from step 1. For username put in the number from your callcentric dashboard that starts with the 1777.... and for password use the password you use to sign into your callcentric account when you signed up. And for Server use callcentric.com then click save in the upper right. It will then try and register and once registered you will see 'Recieving calls'

4)Open up Google Voice on a web browser and go into its settings. Under the phone tab you will now 'Add another phone' name it whatever you want and then put in that other number from your callcentric dashboard. This is that free number from NY you got. Once you save that Google Voice will now attempt to call that number to confirm it. Your Tablet should now ring and you will answer it and type in the 2 digit code it asks for.

Congrats, your tablet now receives all incoming calls to your google voice number.

*To make outgoing calls 1 last step is needed.

5) Included in the zip supplied was the Voice+ apk. Install that as you would normally install an app. Open it up and select your google account that is attached to your google voice. Now checkmark the 'Outgoing call integration' then select 'Callback numbers' and drag your callcentric phone number to the top where it says visible numbers and all other numbers drag below into hidden numbers.

Now your N7 should be a fully functional telephone. Forgot to mention that calls will be made through loudspeaker though... have not tried heaphone calling or bluetooth.

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*There are 2 flashable zips through recovery inside the attachment below and 1 apk to install