The detailed review on A70 is available in my older post called Micromax A70 review. Connecting A70 as modem to PC to connect to internet is not a tough task. However it needs little tweaking. Let us start with downloading the Micromax PC suite which is USB driver.Follow the below steps to use Micromax A70 as a modem to PC.
Steps for Micromax A70 Tethering:
  • First step is to download the USB driver for your A70. The free version of A70 USB driver is available here.
  • Unzip the rar files of Micromax USB driver to a folder.
  • Open and run USBDriver file.
  • Once driver is installed successfully you will get success message.
  • Than go back to the folder Phone suite.
  • Open the folder there is a file Phone suite MFC application run that
    file.
  • Now you'll find the Micromax phone suite window.
  • Connect the handset on comport mode and found new hardware wizard
    will occur on your screen wait a while till its  completes.
  • Now check on the right corner of the Micromax window it indicates
    that phone is connected or disconnected.
  • If it shows connected that means its phone is connected with the Phone suite but if shows disconnected check comport on phone suite from Settings>General>com port that should be same as shown on your
    device manager. (Or that should be the maximum number com port) =20
  • Then it will show connected in right corner of Micromax Phone suite
    window.
  • Then on phone suite click on Settings>Create Connection.
  • Click on New/Modify button now a sub window will open.
  • Enter the fields according to the operators like                                                                             Name:  Aircel
    APN:   aircelgprs
    Number*99#
    user name: blank
    password: blank                                                                                                                           Name:  airtel
    APN:  airtelgprs.com
    Number *99#
    user name: blank
    Password : blank
  • Then click on "New" button and after that "Create" button now
    installing modem will appear(if there is a error for window logo testing
    while installation click on continue anyway)
  • Now you get the message "Connection Created Successfully " click on
    OK.
  • Now Click on Dial Up you'll get your connection name.
  • Select the Sim(sim1 or sim2) for which you have created the connection.
  • Now click on Dial Up button.
  • Then internet will be connected on your PC.
Connecting Micromax A70 with PC by data cable.
  • Open Main Menu
  • Select Setting
  • Wireless and Network
  • Tethering & Portable hotspot
  • Select USB Tethering.
Note: These were the instructions given by Micromax support people to connect A70 to internet from PC. My friend was successfully connected his mobile to PC. So same instructions i have given here. Request your feedback on the same.