YOU SAID:

I lost my smartphone last night in the museum across the street

INTO JAPANESE

昨夜向かいの博物館でスマートフォンをなくした

BACK INTO ENGLISH

I lost my smartphone at the museum across the street last night.

INTO JAPANESE

昨夜向かいの博物館でスマートフォンをなくした。

BACK INTO ENGLISH

I lost my smartphone at the museum across the street last night.