What's your phone number? (informal)

What's your phone number? (formal)

My phone number is 0735455577. 

Can you give me your email address? (informal)

What's your email address? (formal)

My email address is hallo@dw.com.

jemanden an|rufen
ruft an, rief an, hat angerufen
jemanden an|rufen

to call

Can I call you? (informal)

Can I call you? (formal)

I don't have a cell phone.

I don't have an email address. 

Are you on Facebook? 

Are you on WhatsApp? (informal)