Phone numbers are assigned to devices by use of SIM cards. Some android devices such as tablets do not have phone numbers since they do not have a SIM slot.
Unless you're talking about contacting the creators of Android, that would be Google, and they do not have a number that you can call up.
The question is listed under Tablets, so I assume you're talking about tablets. Some tablets have a sim card slot to get cellular data subscription from provider. But no, there is no phone number. Some older tablets had the ability to use as a phone, but not anymore.
The others have offered pretty good information about it. Android itself doesn't not have a phone number. Android is the operating system. Samsung Devices(more phones than tablets) do not come with a built in phone number - that information is in the SIM Card in your device. If you are not sure about if there is a sim card in your device or what carrier you are using, I suggest that you check Settings > About Phone > Status > SIM card status
