Yes, +800 international freephone numbers can be called on the DIDcomms VoIP phone network. However, calls to +800 numbers are not free and have a call cost.
+800 Numbers are officially called Universal International Freephone Numbers or UIFN. These numbers are international and in order to dial them, you must first dial the international call prefix of your country, signified by the “plus” is +800. In most countries, this prefix is 00 (like 0044 for the UK), which is why in many countries UIFN is also known as 00800 numbers. On the DIDcomms VoIP phone network, just dial, for example, Disney 80020060809 to get connected.