Get messages from another phone?

There is no legitimate service that extracts SMS or chat messages from someone else's phone using only their number or name, and the sites selling that are collecting card details rather than delivering data. Messages from a phone you own or administer with consent are recoverable through the account's own backup and the handset itself, so start there.

Owner-recovery path, by platform.

• iPhone: sign in to iCloud.com with the Apple Account that owns the phone and open Messages; if Messages in iCloud is on, the thread history is there, including recent deletions. A device backup in iCloud or on a computer also restores messages onto a phone you control. If the phone is lost rather than merely locked, Find My is the first stop, not a monitoring app.
• Android: a Google One backup restores SMS history onto a device signed in with the same account, and Google Messages' web pairing at messages.google.com shows synced conversations from the paired handset.
• Carrier records: a phone bill shows sender numbers, timestamps and message counts for SMS and MMS, but never the text. That log proves contact happened, not what was said.

Where a dashboard actually fits. Ultimate Phone Spy is installed on a device you physically control, then reports SMS, supported chat apps, call logs, location and web history to a web panel. It runs on Android 4.0+, Windows and Mac. It does not run on iPhone, and there is no remote install — any vendor claiming otherwise is describing something iOS does not permit. Install steps are at https://ultimatephonespy.com/installation-guide and coverage is at https://ultimatephonespy.com/system-requirements.

The line, plainly. Reading another adult's messages without their knowledge is interception under the Wiretap Act in the US, an offence under the Computer Misuse Act in the UK, and a data-protection problem under GDPR; stalking statutes cover the "just tracking, no reading" version too. For a partner's phone the admissible routes are their consent, a court order, or a licensed investigator — not software. Monitoring is defensible for a minor's phone or a company device you administer, disclosed and documented.