There are many Network services provide who provide data cards for their network with attractive offers. Some manufactures like Huawai, D-Link, Micromax and more which lets you to access internet from any sim and it can be called as Multi-Sim Modem. But, if you bought any other network provider modem like Tata Photon,Vodafone,MTNL,MTS,Reliance and Airtel then you can access internet only with their network and you can’t replace any new sim with old one. In brief words, if you’re using Vodafone company modem then you’re allowed only to access internet using Vodafone sim. If you need to use all sim, then you want to unlock USB 3G Data Cards or Songles. Unlocking USB Dongles is an simple tweak which can be done in simple steps.