I need cumin for everything I make, but its not available where i recently moved. However anise is available, and someone told me that cumin can be substituted by anise. Is this true?
I'd say no. These are two very different tastes: anise is freshy with a distinctive aroma than resembles licorice whereas cumin is on the earthy side of the palette.
For substituting cumin I'd go with ground coriander seeds. You'll of course need to adjust quantities
There may be some applications for which aniseed is an acceptable alternative to cumin seeds, but in general, the flavor is not even remotely similar. Caraway seeds would be a better bet, even though they are not something I think someone expecting cumin would accept as sufficiently cumin-like.
When I lived in a small town in Germany, I found that cumin was occasionally available in supermarkets and natural food stores, but the best way to obtain it was to trek to a Middle eastern, Turkish, Greek, Egyptian, Ethiopian or Indian market. Oddly enough, it seemed that all sorts of unrelated "ethnic" ingredients made it to these places, perhaps because foreigners would come to these places hoping to find things that were not available for a reasonable price in normal supermarkets.
For things not available in our small town, I would occasionally make a trek to a larger city by train and buy things there. It turned out that shops in our town were actually doing that themselves on occasion. Now, I would expect that mail order would be a reasonable option, if you're sufficiently remote. It's not terribly expensive to ship an assortment of spices.
If you want Cumin, get cumin, you can order it from Amazon and have it delivered right to your door.