It only can reaches handphone.

English as a Second Language English Vocabulary, Grammar and Idioms
1

That phone can’t make call to local number. It only can reaches handphone.

or

It only can make call to handphone number.

2

This doesn’t really make sense to me. What is ‘that phone’ if it isn’t a ‘handphone’?

Possibly:

That phone cannot make calls to local numbers, it is only connected to the base handset.
You could also use:
It will only reach the base handset.
It can only call the base handset.

3

Thanks.