вот так выглядит финальный запрос для регистрации через androvm
POST
https://i.instagram.com/api/v1/accounts/create/ HTTP/1.1
Content-Length: 411
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Host: i.instagram.com
Connection: Keep-Alive
User-Agent: Instagram 6.3.1 Android (16/4.1.1; 120dpi; 240x320; unknown/generic; androVM for VirtualBox ('Phone' version); vbox86p; vbox86; en_US)
Cookie: ccode=UA; csrftoken=7977b47091e192752b8e16425f405cf4; mid=U-tiuQABAAGyFQLZEg6cLH01iEZk
Cookie2: $Version=1
Accept-Language: en-US
X-IG-Connection-Type: WIFI
Accept-Encoding: gzip
signed_body=78d041ca134effa15210a26eefb7e83893a0bc3401000b148c72939a456ee9b5.%7B%22_csrftoken%22%3A%227977b47091e192752b8e16425f405cf4%22%2C%22first_name%22%3A%22%22%2C%22username%22%3A%22vasjaalohp%22%2C%22email%22%3A%22vasyapetoch%40mail.ru%22%2C%22guid%22%3A%2249ca8740-e663-4ebe-bdd2-70442369f3ce%22%2C%22password%22%3A%2243as0df%22%2C%22device_id%22%3A%22android-e698bb41733d497a%22%7D&ig_sig_key_version=4
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 13 Aug 2014 13:09:25 GMT
Content-Type: application/json
Content-Language: en
Expires: Sat, 01 Jan 2000 00:00:00 GMT
Vary: Cookie, Accept-Language, Accept-Encoding
Pragma: no-cache
Cache-Control: private, no-cache, no-store, must-revalidate
Set-Cookie: csrftoken=7977b47091e192752b8e16425f405cf4; expires=Wed, 12-Aug-2015 13:09:25 GMT; Max-Age=31449600; Path=/
Set-Cookie: sessionid=IGSCdd2c38f83c7422bc97795f3c91a17ad46fbed4367169a013b657c615558f9368%3AUyEf4FBb9K7IhOPPWakkR6CDnz74XScL%3A%7B%22_auth_user_id%22%3A1460746595%2C%22_token%22%3A%221460746595%3As4Cgj3tfrNlNRylDu29otcCW1jbQXwnc%3A5db2960e57d527671c23987531b59091ac7857d7de825ed4e8769b3ceb6858a7%22%2C%22_auth_user_backend%22%3A%22accounts.backends.CaseInsensitiveModelBackend%22%2C%22last_refreshed%22%3A1407935365.499246%2C%22_tl%22%3A1%2C%22_platform%22%3A1%7D; expires=Tue, 11-Nov-2014 13:09:25 GMT; Max-Age=7776000; Path=/;HttpOnly
Set-Cookie: ds_user_id=1460746595; expires=Tue, 11-Nov-2014 13:09:25 GMT; Max-Age=7776000; Path=/
Connection: keep-alive
Content-Length: 211
{"status":"ok","created_user":{"username":"vasjaalohp","pk":1460746595,"profile_pic_url":"http:\/\/images.ak.instagram.com\/profiles\/anonymousUser.jpg","is_private":false,"full_name":""},"account_created":true}