Posted by: lanthus November 9, 2011
PhD & Visa renewal.
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 @Nepali Kanchoo:

As far as I know, if ur visa is expired but have valid I20, i dont know about other countries, but for Canada, if you go to Canada and come back to the US within 30 days, then you r fine. You dont need to stamp the visa in that case. 
Regarding Europe and other countries, you have to have valid visa to re enter the US. It is highly recommend to go back to your own country to renew the visa than other 3rd country. It means, you can get visa from other countries, but the bset possible scenario will be getting stamped from your own country coz a lot of complication may occur depending on visa counselor.

Good Luck sathi....

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