Moving: How To Keep Telephone Number?

[merscher]

I have to move my business from Pathum Thani to Samutprakarn. I want to do everything to keep my telephone and fax numbers! I know that I cannot use these numbers ( 02-987 XXXX) in Samutprakarn. But are there any ways to "keep" the number and then forward the calls to my telephone number. I contacted already True and TOT, but silence...

Any ideas?

Michael