Been a while since I looked at them, but unless something has changed, MySudo used to only offer credit cards on iOS. And, at the time I tried them, their website was not at all good about disclosing the absence of that important feature on Android. Moreover, the price for the service wasn't less on Android despite missing a key feature. They also charged you both annually and also every time you changed a phone number, and with only 5 identities, it wasn't so good for burners. It was cool to have a full communications suite of email, voice and sms in one app, although I never could get the voice function fully working on GOS (without Google Play)
Shortly after I'd paid the annual fee, MySudo summarily cancelled my account for a terms of service violation, saying I'd used MySudo outside the US, and that wasn't allowed. In reality, all I did was connect to a VPN through a US gateway, and VPN had routed my traffic outside the US. It was pretty silly that a privacy oriented service hadn't even considered that someone might use a VPN, but the real irritant was that they cut me off, without ever contacting me or even telling me exactly why. It took me several days to persuade them to get my account reactivated. Overall, not a positive experience. Maybe they've gotten better.