We've had a discussion in general earlier and some SE sites have a 'General Reference' reason for closing questions. Having said that, many questions here on Travel.SE could be answered by Wikitravel or any number of travel sites so where do we draw the line?
My stand is that we should not close them unless they are exact duplicates. The questions may sound similar but it's not necessary at all that getting a SIM card is that easy. For instance, even for pay-as-you-go cards in India you need to provide photographs, proof of residence, and some form of ID to buy a SIM card. A blanket ban will disallow questions like this. Similarly, there could be different rules in other countries - credit checks being the most common form of screening travellers may not be able to meet.