Why do regular texts send but picture messages fail?

They may use different messaging services. SMS supports text but not images or video. Picture messages may use MMS, which uses mobile data and has size limits; RCS can send over mobile data or Wi-Fi when available. So a successful plain text does not by itself show that the connection or service needed for a picture message is working. [S1]

Start by checking your messaging app’s message details or settings to see whether it identifies the picture message as MMS or RCS, if that information is available. Labels and settings vary, so record the type as unknown if you cannot find it rather than guessing.

Check that mobile data is available, then try sending one small image in a one-to-one conversation. MMS requires a data connection. Also check whether your carrier supports MMS and whether your plan has sufficient credit or coverage. [S2]

MMS has size limits and may compress media, but the supplied guidance does not give one maximum size that applies everywhere. [S1] If a small image works but a larger attachment does not, size may be a factor—not proof of the cause. Note what you tried and whether the app identified the message as MMS.

Avoid guessing at network values. For MMS problems in Google Messages, Google recommends restoring APN settings to default. Its troubleshooting guidance also recommends checking carrier support and whether the plan has enough credit or coverage. [S2] The instructions apply to Google Messages and may not match every app or carrier, so check the relevant carrier or app guidance before changing settings elsewhere.

You can give support a concise summary: “Texts send, but picture messages fail. I use [messaging app] on [phone model]. Mobile data is [on/off], and the app identifies the message as [MMS/RCS/unknown]. [A small image / all images] fails.” Avoid sharing private message contents.

Possibly. RCS features require the participants to have RCS enabled, and availability depends on the provider and service terms. [S1] Try a small image in a separate conversation with another willing recipient; if only one conversation or group has trouble, record that distinction. It can help organize the issue, but it does not prove the cause. Google also distinguishes replies in a group MMS conversation from SMS mass-text replies, which arrive as separate conversations. [S2]

Use this order:

1. Try one small image in a one-to-one conversation.
2. Check whether the app identifies it as MMS, RCS, or unknown.
3. For MMS, check mobile-data availability, carrier support, plan credit, and coverage. [S2]
4. If MMS still fails in Google Messages, consider restoring APN settings to default; verify instructions for other apps or carriers first. [S2]
5. Note whether the problem affects one contact, a group, or every recipient, and share those observations with support.

The supplied guidance does not specify a universal attachment limit, a setting path for every phone, or whether a particular carrier supports your account.