Open Mail and sms Editor from PCL Code

Hello,

i would like to call from PCL Library Sms and mail editor from PCL code :

for email : i would like to open with
Resolver.Resolve().LaunchUriAsync(new Uri("mailto:destinataire@exemple.com"));
but nothing happened...

for sms I haven't seen any sample to start sms editor in cross manner.

For me i would like to have the same bahaviour than C# on desktop platform with

Process.Start("mailto:destinataire@exemple.com"; opens Outlook, opens mail editor on each target platform
Process.Start("sms:XXXXXX"; opens Sms editor on each target platform

Thank you for your answer.

Julien.