as far as i know, it allowed but with limitations. eg u can use pull out method and some scholar say u cant use medcine.
Shaykh Yusuf Qardawi said "We cannot forbid something just because Salaf never did it". I agree with him.
So, if we hear some people say, birth control method except pull out (coitus interuptus) method is haram, we must ask them, why they forbid those other methods, if they say Rasulullah (saw) never said about other methods, we can deny their opinion. Many birth control methods in this modern days were not exist in the period of Salaf, but we cannot use it as a reason to forbid. But if those people say, those methods give bad effect or harm the body, we can accept their opinion because there are some daleel to forbid doing or using something that harm the body.
However, not all other methods of birth control harm the body, and haram. We can ask doctors in Muslim hospitals, which methods that permissible for Muslims. Yes, those doctors are not Ulama, but those doctor always seek advice from Ulama and follow what Ulama say.
wow, I am gravely mistaken. For some reason it was always my understanding that using condoms was haraam. for some reason I felt this was a wide known common fact.. but doing a quick google search It seems it is permissible...
Ulama allow Muslim husbands use condom for right purpose, as birth control, and when do sexual relationship only with their wives. But Ulama prohibit the campaign that promote using condom as the way to prevent disease and unwanted pregnancy in free sex.
So, Ulama did not say condom (as a 'device') is haram, but they said using condom (as an action) for wrong purpose is haram.