Seconded. "cellphone" and "mobile phone" are basically interchangeable to me. Though, honestly I'm more likely to just refer to it as a "phone" and use a qual

Seconded. "cellphone" and "mobile phone" are basically interchangeable to me. Though, honestly I'm more likely to just refer to it as a "phone" and use a qualifier to refer to the non-mobile variety (e.g. "house phone" or "land-line")