Below you may find a list of countries that participate in SEPA.
From these locations you should be able to issue SEPA transactions, thus enabling the possibility to create and successfully use the Simplex Account:
Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden.
UK, Iceland, Liechtenstein, Norway, Switzerland, Andorra, Monaco, San Marino, the Vatican City.
You may find more information on how to make a SEPA transaction to top up your successfully opened Simplex Account here in this article.