Getting AltSoftSerial to work with the Fona 3g

Projects General Guidance
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I recently started a project which interacts an accelerometer (I2C) with a Fona 3g gps module. I cannot get them to work together and its driving me crazy! Using the SoftwareSerial library, I was not able to get values from the accelerometer while the gps module was running. I did some online research and found the AltSoftSerial library. this library looks like the solution to my problem but I am unable to find the Fona. I've connected the RX and TX pins to digital 8 and 9 respectively on the Nano but its not working. My accelerometer is connected to digital pins 10 and 12 on the Arduino (SDA and SCL respectively). I am aware that the AltSoftSerial disables the PWM on pin 10 but I don't think that should make a difference.
things to note:
The accelerometer and gps module were working fine independently (when I was using SoftwareSerial with pins 7 and 8 for RX and TX)
I am using the Adafruit 'FONATest' code to troubleshoot.
any help is greatly appreciated.

FONAtest.ino (24.6 KB)

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My accelerometer is connected to digital pins 10 and 12 on the Arduino (SDA and SCL respectively).

SDA/SCL are not on pin 10/12 on the Nano!

Using the SoftwareSerial library, I was not able to get values from the accelerometer while the gps module was running.

Which SoftwareSerial version are you using? With a current IDE version SoftwareSerial isn't blocking as much as in earlier versions, so it should work if you use the hardware I2C interface (see above).