I have an extra Airtel SIM which one of my relatives was using and he has moved to another city, so I have this SIM and it's active. I have a very pathetic BSNL internet which goes out of order very often and I need a back up internet connection. I was thinking if it is good to buy a 3G data card and use the existing 2G SIM in it. Is Airtel 3G internet good? Do you feel it is better to buy a 3G phone which I can connect to my laptop when required, so that I can browse videos etc 'on the move'? (Of course, I don't have too much money to invest in a 3G phone right now and I have my own mobile, so I don't need this SIM to make calls. I can only invest about 1500 right now. )Do you feel it's better to buy a data card from Airtel or should I buy an unlocked one from ebay?As someone else has already asked, will a 3G pack loaded in one city be valid in another city? Thanks for your replies in advance.