Fix RCS on iOS 18 beta 2

README.md

Before you try this, try just toggling RCS off and on first. It may work. Otherwise, continue on.

Requirements

• iOS 18 beta 2
• T-Mobile US, Verizon, or AT&T
  • Most MVNOs are not compatible. If you do not already see the RCS switch in Settings > Apps > Messages, this will not work for you.

Steps

1. Install mitmproxy
2. Download redirect.py
3. mitmweb -s redirect.py --listen-port 8888 --ssl-insecure --allow-hosts jibecloud.net
4. Configure the proxy on your device to use the IP address of the machine running mitmproxy and port 8888
5. Go to http://mitm.it on your device, download the certificate, go to Settings, and then install it.
6. Go to General > About > Certificate Trust Settings and enable full trust for the mitmproxy certificate.
7. Turn RCS off (if applicable) and then back on. Wait a few seconds, then check for RCS in Messages. (Additionally, if all went well, you should see "RCS flow complete!" in the mitmproxy console.)
8. Remove the proxy settings from your device and optionally uninstall the certificate.

Here is an example of a successful activation.

redirect.py

import logging

from mitmproxy import http
from mitmproxy.log import ALERT


logger = logging.getLogger(__name__)


def request(flow: http.HTTPFlow) -> None:
    if flow.request.pretty_host.endswith("jibecloud.net"):
        logger.info(f"Request to {flow.request.pretty_url} received.")
        flow.request.path = flow.request.path.replace("terminal_sw_version=iOS", "terminal_sw_version=fzw")
        logger.info(f"New URL: {flow.request.pretty_url}")


def response(flow: http.HTTPFlow) -> None:
    if flow.request.pretty_host.endswith("jibecloud.net"):
        logger.info(f"Response to {flow.request.pretty_url} received.")
        # print(f"Response: {flow.response.content}")

        if "?otp" in flow.request.path:
            if flow.response.status_code == 200:
                logger.log(ALERT, "RCS flow complete!")

Strangely, to get this working on iPhone 14 Pro I had to change the iPhone model in the request. With that tweak this works for me on iPhone 14 Pro on Verizon.

Interesting. This just broke registration for me. I would recommend trying it without changing the model first, and attempting this if that doesn't work.

I’m wondering if there is a way of setting your region as US, in the device settings, then use a VPN and location spoofer to activate RCS?

No, RCS support is defined by the carrier bundle as I explain here.

I get this when trying to enable RCS after turning the toggle off. I turned off all my other profiles, but this keeps popping up:

Client TLS handshake failed. The client disconnected during the handshake. If this happens consistently for config.rcs.mnc480.mcc311.jibecloud.net, this may indicate that the client does not trust the proxy's certificate.

Client TLS handshake failed. The client disconnected during the handshake. If this happens consistently for config.rcs.mnc480.mcc311.jibecloud.net, this may indicate that the client does not trust the proxy's certificate.

Did you do step 5 and 6?

There seems to be no need to change the phone model. I have an iPhone 12 Pro, and it works just fine... That is after I did the Step 6 of enabling full trust for the mitmproxy certificate. So if anyone only sees the response with 511, it means they must have skipped step 6 like I did.

EDIT: This seems to be obsolete now, as RCS seems to be enabled on the Server side now for iPhones.

@dhinakg Any idea why RBM is not working on Beta 3 even though RCS is and RBM was working just fine on Beta 2?