[Ties Brants]

I understand. But if you use a Belgium sim card that roams on the Dutch networks you should be able to find out if you have coverage on a Dutch network. And also how the signal quality is.

Or take a Vodafone NL card. With vodafone Buurlanden you can receive calls in Belgium and Germany for free (if I remember correctly it cost 4,95 per month) It is not really easy to find on the Vodafone site. But is there somewhere.