The new phone is charged, the old one leaves for the shop at nine tomorrow, and WhatsApp is the only thing still unmoved. It is also the only app where a wrong order of steps can lose years of chat with no undo. The backup either exists on Google Drive or iCloud before you wipe the old handset, or it does not exist at all.
What the backup actually holds
On Android, WhatsApp writes a chat archive into the Google account already linked to the phone, and that archive shares the same 15 GB free Drive quota as Gmail and Photos. Text is always included. Photos, video and voice notes only travel if “Include videos” is enabled in the backup settings, which is off on many phones installed by a carrier. Google’s Drive also caps what WhatsApp can store per account, so a decade of group chats can silently shrink to the most recent portion.
On iPhone the equivalent sits in iCloud under the app’s own backup entry, and it counts against the 5 GB free tier — the reason a 40 GB photo library often breaks chat backups without any error message. Note the direction that does not work: an iCloud chat backup cannot be restored onto an Android phone, and a Google Drive backup cannot be restored onto an iPhone.
Read the date on the last backup first
Before packing anything, confirm there is something to restore. On Android: Settings, Chats, Chat backup, and read the “Last backup” line. On iPhone: Settings, Chats, Chat Backup, then Last Backup. If it says “Never” or the date is weeks old, stop and fix that now.
The usual causes are boring: the phone has only been on mobile data at the scheduled hour, the Drive or iCloud account is full, or backups were switched off when the phone was set up. Check storage first, because a full account fails silently and no amount of tapping “Back up now” will help.
Run a manual backup and stay on the screen
Tap Back up now with the phone on Wi-Fi and plugged into a charger. For a chat history of 1–2 GB including media, expect five to twenty minutes. Keep WhatsApp in the foreground — Android suspends uploads from backgrounded apps on many battery-saving profiles, which is the single most common reason a backup appears stuck at a percentage.
Watch the data cost if you skip the Wi-Fi step. At roughly 3 GB of media, a mid-range Bangladeshi mobile package can burn through a week of allowance in one upload, and a US prepaid plan at $10 per GB makes it an expensive mistake. Media can also be backed up later, separately, so text first is a reasonable compromise when time is short.
Restore happens once, at setup
Install WhatsApp on the new phone and register the same number. After the six-digit verification code, the app offers “Restore” — that prompt appears before you can send a message, and if you tap Skip there is no button to bring it back later without reinstalling and clearing data.
The Google account signed into the new phone must be the same one that received the backup; a second account on the device is not enough. On iPhone the Apple ID has to match. If the prompt never appears, the app is almost always looking at a different account or a different phone number, including a number that changed format when the SIM moved country.
Moving between iPhone and Android
WhatsApp’s own backup format does not cross platforms, so use the official migration tools instead. Android to iPhone uses the Move to iOS app during iPhone setup. iPhone to Android uses the cable-based transfer offered during setup on most recent Samsung, Pixel and Oppo phones. Both keep the cable connected for the whole transfer — expect 20 to 60 minutes for a heavy history — and both need the old phone unlocked and online.
If neither tool is available on your models, the fallback is per-chat export: open a conversation, tap More, then Export chat, and mail it to yourself with media attached. It is tedious for dozens of threads, but it is the only method that works when the platforms refuse to cooperate, and it preserves the messages most people actually care about.
When the restore comes back partial
A restored history that stops at an old date is normal in two situations: the Drive cap trimmed the archive, or media was excluded from the backup. Neither is a bug. The craft worth learning is keeping a second copy of threads that matter — a family group, a work negotiation — by exporting them to email quarterly and letting those exports live in a folder you actually back up. That is the same discipline as any phone backup routine, and it costs less than the argument you would have about a missing receipt.
If Drive is the thing that failed, freeing quota is the fix rather than buying storage: a Drive cleanup usually recovers several gigabytes from old Gmail attachments. WhatsApp’s own instructions for the Android case are short and worth reading once before you start — How to back up your chat history.
Do the backup the night before, verify the date changed, and only then factory-reset the old phone. The order matters more than any setting on this list.