@renan See the number format given below
**With country code as +880 for Bangladesh** `+8801617738438` It's correct
**With country code as 00880 for Bangladesh** `008801617738438` It's also correct
_**note**: for writing country code any can use **+** or **00** before country code_
**_Without_ country code** `1617738438` It's also correct

[Reference](http://countrycode.org/bangladesh)